Chemistry · Textbook solutions
Alcohols, Phenols and Ethers
Every solved example, exercise, and miscellaneous question, in the order the textbook teaches them. Plus every board question asked from this chapter. · 52 questions
Worked Examples
7 q
Solved Examples
Worked · 7
- Eg 7.1Give IUPAC names of the following compounds: (i) (ii) (iii) a benzene ring carrying at position 1 and groups at both positions 2 and 6 (iv) a cyclohexane ring carrying at one carbon and at the adjacent carbon
- Eg 7.2Give the structures and IUPAC names of the products expected from the following reactions: (a) Catalytic reduction of butanal. (b) Hydration of propene in the presence of dilute sulphuric acid. (c) Reaction of propanone with methylmagnesium bromide followed by hydrolysis.
- Eg 7.3Arrange the following sets of compounds in order of their increasing boiling points: (a) Pentan-1-ol, butan-1-ol, butan-2-ol, ethanol, propan-1-ol, methanol. (b) Pentan-1-ol, n-butane, pentanal, ethoxyethane.
- Eg 7.4Arrange the following compounds in increasing order of their acid strength: Propan-1-ol, 2,4,6-trinitrophenol, 3-nitrophenol, 3,5-dinitrophenol, phenol, 4-methylphenol.
- Eg 7.5Write the structures of the major products expected from the following reactions: (a) Mononitration of 3-methylphenol (b) Dinitration of 3-methylphenol (c) Mononitration of phenyl methanoate.
- Eg 7.6The following is not an appropriate reaction for the preparation of t-butyl ethyl ether: (i) What would be the major product of this reaction? (ii) Write a suitable reaction for the preparation of t-butylethyl ether.
- Eg 7.7Give the major products that are formed by heating each of the following ethers with HI. (i) (ii) (iii)
Intext Questions
12 q
- Intext 7.1Classify the following as primary, secondary and tertiary alcohols: (i) (ii) (iii) (iv) (v) (vi)
- Refer to the six alcohols listed in Intext Question 7.1: (i) (ii) (iii) (iv) (v) (vi)Intext 7.2Identify allylic alcohols in the above examples.
- Intext 7.3Name the following compounds according to IUPAC system. (i) (ii) (iii) a cyclohexane ring carrying at position 1 and at position 3 (iv) (v)
- Intext 7.4Show how are the following alcohols prepared by the reaction of a suitable Grignard reagent on methanal? (i) (ii) cyclohexyl (a cyclohexane ring bearing a group)
- Intext 7.5Write structures of the products of the following reactions: (i) (ii) methyl 2-(2-oxocyclohexyl)acetate, i.e. a cyclohexanone ring bearing a group on the carbon adjacent to the ring carbonyl, treated with (iii)
- Intext 7.6Give structures of the products you would expect when each of the following alcohol reacts with (a) (b) HBr and (c) . (i) Butan-1-ol (ii) 2-Methylbutan-2-ol
- Intext 7.7Predict the major product of acid catalysed dehydration of (i) 1-methylcyclohexanol and (ii) butan-1-ol
- Intext 7.8Ortho and para nitrophenols are more acidic than phenol. Draw the resonance structures of the corresponding phenoxide ions.
- Intext 7.9Write the equations involved in the following reactions: (i) Reimer - Tiemann reaction (ii) Kolbe's reaction
- Intext 7.10Write the reactions of Williamson synthesis of 2-ethoxy-3-methylpentane starting from ethanol and 3-methylpentan-2-ol.
- Intext 7.11Which of the following is an appropriate set of reactants for the preparation of 1-methoxy-4-nitrobenzene and why? (i) a benzene ring carrying at C-1 and at C-4, together with (ii) a benzene ring carrying at C-1 and at C-4, together with
- Intext 7.12Predict the products of the following reactions: (i) (ii) (iii) (iv)
Exercises
33 q
- Ex 7.1Write IUPAC names of the following compounds: (i) (ii) (iii) (iv) (v) a benzene ring bearing and a group ortho to it (vi) a benzene ring bearing and a group para to it (vii) a benzene ring bearing , with one ortho to the and a second meta to the on the opposite side of the ring (viii) a benzene ring bearing with a group at each of the two positions ortho to it (ix) (x) (xi) (xii)
- Ex 7.2Write structures of the compounds whose IUPAC names are as follows: (i) 2-Methylbutan-2-ol (ii) 1-Phenylpropan-2-ol (iii) 3,5-Dimethylhexane-1,3,5-triol (iv) 2,3-Diethylphenol (v) 1-Ethoxypropane (vi) 2-Ethoxy-3-methylpentane (vii) Cyclohexylmethanol (viii) 3-Cyclohexylpentan-3-ol (ix) Cyclopent-3-en-1-ol (x) 4-Chloro-3-ethylbutan-1-ol.
- Ex 7.3(i) Draw the structures of all isomeric alcohols of molecular formula and give their IUPAC names. (ii) Classify the isomers of alcohols in question 11.3 (i) as primary, secondary and tertiary alcohols.
- Ex 7.4Explain why propanol has higher boiling point than that of the hydrocarbon, butane?
- Ex 7.5Alcohols are comparatively more soluble in water than hydrocarbons of comparable molecular masses. Explain this fact.
- Ex 7.6What is meant by hydroboration-oxidation reaction? Illustrate it with an example.
- Ex 7.7Give the structures and IUPAC names of monohydric phenols of molecular formula, .
- Ex 7.8While separating a mixture of ortho and para nitrophenols by steam distillation, name the isomer which will be steam volatile. Give reason.
- Ex 7.9Give the equations of reactions for the preparation of phenol from cumene.
- Ex 7.10Write chemical reaction for the preparation of phenol from chlorobenzene.
- Ex 7.11Write the mechanism of hydration of ethene to yield ethanol.
- Ex 7.12You are given benzene, conc. and NaOH. Write the equations for the preparation of phenol using these reagents.
- Ex 7.13Show how will you synthesise: (i) 1-phenylethanol from a suitable alkene. (ii) cyclohexylmethanol using an alkyl halide by an reaction. (iii) pentan-1-ol using a suitable alkyl halide?
- Ex 7.14Give two reactions that show the acidic nature of phenol. Compare acidity of phenol with that of ethanol.
- Ex 7.15Explain why is ortho nitrophenol more acidic than ortho methoxyphenol ?
- Ex 7.16Explain how does the group attached to a carbon of benzene ring activate it towards electrophilic substitution?
- Ex 7.17Give equations of the following reactions: (i) Oxidation of propan-1-ol with alkaline solution. (ii) Bromine in with phenol. (iii) Dilute with phenol. (iv) Treating phenol wih chloroform in presence of aqueous NaOH.
- Ex 7.18Explain the following with an example. (i) Kolbe's reaction. (ii) Reimer-Tiemann reaction. (iii) Williamson ether synthesis. (iv) Unsymmetrical ether.
- Ex 7.19Write the mechanism of acid dehydration of ethanol to yield ethene.
- Ex 7.20How are the following conversions carried out? (i) Propene Propan-2-ol. (ii) Benzyl chloride Benzyl alcohol. (iii) Ethyl magnesium chloride Propan-1-ol. (iv) Methyl magnesium bromide 2-Methylpropan-2-ol.
- Ex 7.21Name the reagents used in the following reactions: (i) Oxidation of a primary alcohol to carboxylic acid. (ii) Oxidation of a primary alcohol to aldehyde. (iii) Bromination of phenol to 2,4,6-tribromophenol. (iv) Benzyl alcohol to benzoic acid. (v) Dehydration of propan-2-ol to propene. (vi) Butan-2-one to butan-2-ol.
- Ex 7.22Give reason for the higher boiling point of ethanol in comparison to methoxymethane.
- Ex 7.23Give IUPAC names of the following ethers: (i) (ii) (iii) (iv) (v) a cyclohexane ring carrying two groups on one ring carbon and on the ring carbon para to it (vi) a benzene ring carrying
- Ex 7.24Write the names of reagents and equations for the preparation of the following ethers by Williamson's synthesis: (i) 1-Propoxypropane (ii) Ethoxybenzene (iii) 2-Methoxy-2-methylpropane (iv) 1-Methoxyethane
- Ex 7.25Illustrate with examples the limitations of Williamson synthesis for the preparation of certain types of ethers.
- Ex 7.26How is 1-propoxypropane synthesised from propan-1-ol? Write mechanism of this reaction.
- Ex 7.27Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method. Give reason.
- Ex 7.28Write the equation of the reaction of hydrogen iodide with: (i) 1-propoxypropane (ii) methoxybenzene and (iii) benzyl ethyl ether.
- Ex 7.29Explain the fact that in aryl alkyl ethers (i) the alkoxy group activates the benzene ring towards electrophilic substitution and (ii) it directs the incoming substituents to ortho and para positions in benzene ring.
- Ex 7.30Write the mechanism of the reaction of HI with methoxymethane.
- Ex 7.31Write equations of the following reactions: (i) Friedel-Crafts reaction alkylation of anisole. (ii) Nitration of anisole. (iii) Bromination of anisole in ethanoic acid medium. (iv) Friedel-Craft's acetylation of anisole.
- Ex 7.32Show how would you synthesise the following alcohols from appropriate alkenes? (i) a cyclohexane ring bearing and on the same ring carbon (ii) (iii) (iv) a cyclohexane ring attached to a carbon bearing , and
- Ex 7.33When 3-methylbutan-2-ol is treated with HBr, the following reaction takes place: Give a mechanism for this reaction. (Hint : The secondary carbocation formed in step II rearranges to a more stable tertiary carbocation by a hydride ion shift from 3rd carbon atom.
What the board has asked from this chapter
Questions per paper · 21 papers · 2023 to 2026
Bars average the full papers of each year. 62 further questions come from set variants and are listed below.
2023: 3.8 questions per paper. 2024: 3.8 questions per paper. 2025: 4 questions per paper. 2026: 5 questions per paper
2026
38 q
- 2The intermediate formed during the slowest step involved in the dehydration of alcohol is :
Tap an option to check your answer.
Alcohols and Phenols - 2Dehydration of tertiary alcohols with Cu at 573 K gives :
Tap an option to check your answer.
Alcohols and Phenols - 2Lucas reagent produces cloudiness immediately with :
Tap an option to check your answer.
Alcohols and Phenols - 3Which of the following product is formed when salicylic acid is treated with in the presence of acid ?
Tap an option to check your answer.
Alcohols and Phenols - 4The dehydration of 1°, 2° and 3° alcohols follows the order :
Tap an option to check your answer.
Alcohols and Phenols - 4Williamson synthesis is an example of :
Tap an option to check your answer.
Ethers - 6Which of the following Grignard Reagent will be used to prepare cyclohexylmethanol when treated with methanal ?
Tap an option to check your answer.
Alcohols and Phenols - 6Aspirin is obtained by acetylation of
Tap an option to check your answer.
Alcohols and Phenols - 8At low temperature, phenol reacts with dil. to yield
Tap an option to check your answer.
Alcohols and Phenols - 8on reaction with HI gives
Tap an option to check your answer.
Ethers - 8Identify the correct increasing order of boiling points of the given compounds :
Tap an option to check your answer.
Alcohols and Phenols - 8At low temperature, phenol on reaction with in gives
Tap an option to check your answer.
Alcohols and Phenols - 9Primary, secondary and tertiary alcohols can be distinguished by :
Tap an option to check your answer.
Alcohols and Phenols - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.13Assertion (A) : Alcohols act as Bronsted bases as well as Bronsted acids. Reason (R) : Alcohols react as both nucleophiles and electrophiles.
Tap an option to check your answer.
Alcohols and Phenols - For questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :13Assertion (A) : The presence of –OH group in phenols directs the incoming group to ortho and para positions. Reason (R) : –OH group in phenols activates the aromatic ring towards electrophilic substitution reaction.
Tap an option to check your answer.
Alcohols and Phenols - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :13Assertion (A) : Ethers have lower boiling points than the boiling points of alcohols. Reason (R) : This is due to the presence of hydrogen bonding in alcohols.
Tap an option to check your answer.
Ethers - For questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :13Assertion (A) : The presence of –OH group in phenols directs the incoming group at ortho- and para- positions. Reason (R) : –OH group in phenols deactivates the aromatic ring.
Tap an option to check your answer.
Alcohols and Phenols - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.13Assertion (A) : Alcohols act as Bronsted bases as well as Bronsted acids. Reason (R) : It is due to the presence of unshared electron pairs on oxygen atom and presence of polar O – H bond.
Tap an option to check your answer.
Alcohols and Phenols - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.13Assertion (A) : gives and on reaction with HI. Reason (R) : The reaction occurs by mechanism.
Tap an option to check your answer.
Ethers - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :14Assertion (A) : Phenol is less acidic than 4-methylphenol. Reason (R) : The presence of an electron releasing group in phenol makes it less acidic.
Tap an option to check your answer.
Alcohols and Phenols - For questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :14Assertion (A) : The presence of –OH group in phenols directs the incoming group to meta position in the ring. Reason (R) : –OH group in phenols activates the aromatic ring towards electrophilic substitution reaction.
Tap an option to check your answer.
Alcohols and Phenols - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :14Assertion (A) : Phenol is more acidic than 4-methylphenol. Reason (R) : The presence of an electron releasing group in phenol makes it more acidic.
Tap an option to check your answer.
Alcohols and Phenols - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.15Assertion (A) : p-nitrophenol is more acidic than phenol. Reason (R) : Nitro group is an electron-withdrawing group, it stabilises phenoxide ion by dispersal of negative charge.
Tap an option to check your answer.
Alcohols and Phenols - 27Write the reaction involved in the following : (a) Reimer-Tiemann reaction (b) Kolbe’s reaction (c) Friedal-Crafts acylation of anisoleAlcohols and Phenols
- Alcohols and Phenols are acidic in nature. Electron withdrawing groups in phenol increase its acidic strength and electron releasing groups decrease it. Alcohols undergo nucleophilic substitution with hydrogen halides to yield alkyl halides. Dehydration of alcohols gives alkenes. On oxidation, primary alcohols yield aldehydes with mild oxidising agents and carboxylic acids with strong oxidising agents, while secondary alcohols yield ketones. Tertiary alcohols are resistant to oxidation. The presence of – OH group in phenols activates the aromatic ring towards electrophilic substitution and directs the incoming group to ortho and para positions due to resonance effect.29 (a)Write the mechanism of acid dehydration of ethanol to yield ethene.Alcohols and Phenols
- Ethers are prepared by the dehydration of alcohols in presence of protic acids at 413 K. Symmetrical and unsymmetrical ethers can also be prepared by Williamson synthesis. This reaction involves attack of an alkoxide ion on primary alkyl halide. If a tertiary alkyl halide is used, elimination reaction occurs and an alkene is formed, no ether is formed. C – O bond in ethers are cleaved under drastic conditions with excess of HI. When unsymmetrical ethers react with HI, the alkyl halide is formed from smaller alkyl group. If one of the alkyl group is tertiary, the alkyl halide is formed from the tertiary alkyl group because tertiary alkyl carbocation is more stable than the primary carbocation. Cleavage of alkyl aryl ethers takes place at the alkyl-oxygen bond due to more stable aryl-oxygen bond. The order of reactivity of hydrogen halides is HI > HBr > HCl. Aromatic ethers undergo electrophilic substitution reactions. The alkoxy group attached to the aromatic ring activates the ring towards electrophilic substitution and directs the incoming group to ortho- and para-positions.29 (a)Complete the following equations : (i) anisole + (ii) anisoleEthers
- Ethers are prepared by the dehydration of alcohols in presence of protic acids at 413 K. Symmetrical and unsymmetrical ethers can also be prepared by Williamson synthesis. This reaction involves attack of an alkoxide ion on primary alkyl halide. If a tertiary alkyl halide is used, elimination reaction occurs and an alkene is formed, no ether is formed. C – O bond in ethers are cleaved under drastic conditions with excess of HI. When unsymmetrical ethers react with HI, the alkyl halide is formed from smaller alkyl group. If one of the alkyl group is tertiary, the alkyl halide is formed from the tertiary alkyl group because tertiary alkyl carbocation is more stable than the primary carbocation. Cleavage of alkyl aryl ethers takes place at the alkyl-oxygen bond due to more stable aryl-oxygen bond. The order of reactivity of hydrogen halides is HI > HBr > HCl. Aromatic ethers undergo electrophilic substitution reactions. The alkoxy group attached to the aromatic ring activates the ring towards electrophilic substitution and directs the incoming group to ortho- and para-positions.29 (b)Write the names of alkyl halide and sodium alkoxide used to prepare tert-butyl ethyl ether.Ethers
- Alcohols and Phenols are acidic in nature. Electron withdrawing groups in phenol increase its acidic strength and electron releasing groups decrease it. Alcohols undergo nucleophilic substitution with hydrogen halides to yield alkyl halides. Dehydration of alcohols gives alkenes. On oxidation, primary alcohols yield aldehydes with mild oxidising agents and carboxylic acids with strong oxidising agents, while secondary alcohols yield ketones. Tertiary alcohols are resistant to oxidation. The presence of – OH group in phenols activates the aromatic ring towards electrophilic substitution and directs the incoming group to ortho and para positions due to resonance effect.29 (b)Why are tertiary alcohols resistant to oxidation ?Alcohols and Phenols
- Alcohols and Phenols are acidic in nature. Electron withdrawing groups in phenol increase its acidic strength and electron releasing groups decrease it. Alcohols undergo nucleophilic substitution with hydrogen halides to yield alkyl halides. Dehydration of alcohols gives alkenes. On oxidation, primary alcohols yield aldehydes with mild oxidising agents and carboxylic acids with strong oxidising agents, while secondary alcohols yield ketones. Tertiary alcohols are resistant to oxidation. The presence of – OH group in phenols activates the aromatic ring towards electrophilic substitution and directs the incoming group to ortho and para positions due to resonance effect.29 (b) ORWrite the structure of the major product expected from the dinitration of 3-methylphenol.Alcohols and Phenols
- Ethers are prepared by the dehydration of alcohols in presence of protic acids at 413 K. Symmetrical and unsymmetrical ethers can also be prepared by Williamson synthesis. This reaction involves attack of an alkoxide ion on primary alkyl halide. If a tertiary alkyl halide is used, elimination reaction occurs and an alkene is formed, no ether is formed. C – O bond in ethers are cleaved under drastic conditions with excess of HI. When unsymmetrical ethers react with HI, the alkyl halide is formed from smaller alkyl group. If one of the alkyl group is tertiary, the alkyl halide is formed from the tertiary alkyl group because tertiary alkyl carbocation is more stable than the primary carbocation. Cleavage of alkyl aryl ethers takes place at the alkyl-oxygen bond due to more stable aryl-oxygen bond. The order of reactivity of hydrogen halides is HI > HBr > HCl. Aromatic ethers undergo electrophilic substitution reactions. The alkoxy group attached to the aromatic ring activates the ring towards electrophilic substitution and directs the incoming group to ortho- and para-positions.29 (b) ORAnisole on reaction with HI gives phenol and and not methanol and iodobenzene. Justify the statement.Ethers
- Alcohols and Phenols are acidic in nature. Electron withdrawing groups in phenol increase its acidic strength and electron releasing groups decrease it. Alcohols undergo nucleophilic substitution with hydrogen halides to yield alkyl halides. Dehydration of alcohols gives alkenes. On oxidation, primary alcohols yield aldehydes with mild oxidising agents and carboxylic acids with strong oxidising agents, while secondary alcohols yield ketones. Tertiary alcohols are resistant to oxidation. The presence of – OH group in phenols activates the aromatic ring towards electrophilic substitution and directs the incoming group to ortho and para positions due to resonance effect.29 (c)Why is ortho-nitrophenol more acidic than ortho-methoxyphenol ?Alcohols and Phenols
- Ethers are prepared by the dehydration of alcohols in presence of protic acids at 413 K. Symmetrical and unsymmetrical ethers can also be prepared by Williamson synthesis. This reaction involves attack of an alkoxide ion on primary alkyl halide. If a tertiary alkyl halide is used, elimination reaction occurs and an alkene is formed, no ether is formed. C – O bond in ethers are cleaved under drastic conditions with excess of HI. When unsymmetrical ethers react with HI, the alkyl halide is formed from smaller alkyl group. If one of the alkyl group is tertiary, the alkyl halide is formed from the tertiary alkyl group because tertiary alkyl carbocation is more stable than the primary carbocation. Cleavage of alkyl aryl ethers takes place at the alkyl-oxygen bond due to more stable aryl-oxygen bond. The order of reactivity of hydrogen halides is HI > HBr > HCl. Aromatic ethers undergo electrophilic substitution reactions. The alkoxy group attached to the aromatic ring activates the ring towards electrophilic substitution and directs the incoming group to ortho- and para-positions.29 (c)Why is C – O – C bond angle in ethers slightly greater than tetrahedral angle ?Ethers
- Alcohols have higher boiling points than other compounds, namely hydrocarbons, ethers and haloalkanes of comparable molecular masses. On oxidation, primary alcohols yield aldehydes with mild oxidizing agents and carboxylic acids with strong oxidizing agents. Secondary alcohols yield ketones on oxidation while tertiary alcohols are resistant to oxidation. Ethers may be prepared by dehydration of alcohols and Williamson synthesis. The C – O bond in ethers can be cleaved by hydrogen halides. The presence of – OH group in phenols activates the aromatic ring towards electrophilic substitution and directs the incoming group to ortho and para positions due to resonance effect. In presence of NaOH, phenol generates phenoxide ion which is even more reactive than phenol. Thus, in alkaline medium, phenol undergoes Kolbe’s reaction.30 (a)Name the reagents used in the following reactions : (i) Oxidation of a primary alcohol to aldehyde (ii) Oxidation of a primary alcohol to carboxylic acidAlcohols and Phenols
- Alcohols have higher boiling points than other compounds, namely hydrocarbons, ethers and haloalkanes of comparable molecular masses. On oxidation, primary alcohols yield aldehydes with mild oxidizing agents and carboxylic acids with strong oxidizing agents. Secondary alcohols yield ketones on oxidation while tertiary alcohols are resistant to oxidation. Ethers may be prepared by dehydration of alcohols and Williamson synthesis. The C – O bond in ethers can be cleaved by hydrogen halides. The presence of – OH group in phenols activates the aromatic ring towards electrophilic substitution and directs the incoming group to ortho and para positions due to resonance effect. In presence of NaOH, phenol generates phenoxide ion which is even more reactive than phenol. Thus, in alkaline medium, phenol undergoes Kolbe’s reaction.30 (b)Write the reaction involved in Kolbe’s reaction.Alcohols and Phenols
- Alcohols have higher boiling points than other compounds, namely hydrocarbons, ethers and haloalkanes of comparable molecular masses. On oxidation, primary alcohols yield aldehydes with mild oxidizing agents and carboxylic acids with strong oxidizing agents. Secondary alcohols yield ketones on oxidation while tertiary alcohols are resistant to oxidation. Ethers may be prepared by dehydration of alcohols and Williamson synthesis. The C – O bond in ethers can be cleaved by hydrogen halides. The presence of – OH group in phenols activates the aromatic ring towards electrophilic substitution and directs the incoming group to ortho and para positions due to resonance effect. In presence of NaOH, phenol generates phenoxide ion which is even more reactive than phenol. Thus, in alkaline medium, phenol undergoes Kolbe’s reaction.30 (c) (i)Why are tertiary alcohols resistant to oxidation ?Alcohols and Phenols
- Alcohols have higher boiling points than other compounds, namely hydrocarbons, ethers and haloalkanes of comparable molecular masses. On oxidation, primary alcohols yield aldehydes with mild oxidizing agents and carboxylic acids with strong oxidizing agents. Secondary alcohols yield ketones on oxidation while tertiary alcohols are resistant to oxidation. Ethers may be prepared by dehydration of alcohols and Williamson synthesis. The C – O bond in ethers can be cleaved by hydrogen halides. The presence of – OH group in phenols activates the aromatic ring towards electrophilic substitution and directs the incoming group to ortho and para positions due to resonance effect. In presence of NaOH, phenol generates phenoxide ion which is even more reactive than phenol. Thus, in alkaline medium, phenol undergoes Kolbe’s reaction.30 (c) (ii)Write the products of the following reaction :Ethers
- 33 (A)An organic compound 'A', with molecular formula reacts with active metals such as sodium to give compound 'B' and hydrogen gas. 'A' on treatment with iodine and sodium hydroxide gives 'C' and in presence of at 413 K gives 'D' (). 'D' on reaction with excess of HI gives 'E'. Identify 'A', 'B', 'C', 'D' and 'E' and write all the reactions involved.Alcohols and Phenols
- 33 (B)(a) Write the reagents which are used in the given conversions : (i) Phenol to 2, 4, 6 - tribromophenol (ii) Propene to propan-1-ol (iii) Butan-2-one to butan-2-ol (b) Explain the mechanism of acid catalyzed hydration of alkene to form corresponding alcohol.Alcohols and Phenols
2025
40 q
- 1During dehydration of alcohol to alkene by heating with conc. , the initiation step is :
Tap an option to check your answer.
Alcohols and Phenols - 1Which by-product is obtained in the manufacture of phenol from cumene ?
Tap an option to check your answer.
Alcohols and Phenols - 1Williamson synthesis of preparing unsymmetrical ether is :
Tap an option to check your answer.
Ethers - 8In the reaction , what is the correct order of reactivity of alcohols ?
Tap an option to check your answer.
Alcohols and Phenols - 8The reaction suggests that phenol is :
Tap an option to check your answer.
Alcohols and Phenols - 8The reaction suggests that alcohols are :
Tap an option to check your answer.
Alcohols and Phenols - 8Which is the correct order of acid strength from the following ?
Tap an option to check your answer.
Alcohols and Phenols - 8What will be formed after oxidation reaction of secondary alcohol with chromic anhydride ?
Tap an option to check your answer.
Alcohols and Phenols - 9Phenol reacts with Bromine water to form :
Tap an option to check your answer.
Alcohols and Phenols - 9At low temperature, phenol reacts with in to form :
Tap an option to check your answer.
Alcohols and Phenols - 9The conversion of phenol to salicylic acid can be accomplished by
Tap an option to check your answer.
Alcohols and Phenols - 9Phenol reacts with conc. to form :
Tap an option to check your answer.
Alcohols and Phenols - 12Alkenes are formed by heating alcohols with conc. . The first step in the reaction is :
Tap an option to check your answer.
Alcohols and Phenols - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.13Assertion (A) : A mixture of -nitrophenol and -nitrophenol can be separated by steam distillation. Reason (R) : -nitrophenol is steam volatile due to intramolecular hydrogen bonding.
Tap an option to check your answer.
Alcohols and Phenols - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.13Assertion (A) : A mixture of -nitrophenol and -nitrophenol can be separated by steam distillation. Reason (R) : -nitrophenol is steam volatile due to intermolecular hydrogen bonding.
Tap an option to check your answer.
Alcohols and Phenols - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.13Assertion (A) : A mixture of -nitrophenol and -nitrophenol can be separated by fractional distillation. Reason (R) : -nitrophenol is steam volatile due to intramolecular hydrogen bonding.
Tap an option to check your answer.
Alcohols and Phenols - For questions number 13 to 16, two statements are given - one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :15Assertion (A) : The boiling point of ethanol is higher than that of methoxymethane. Reason (R) : There is intramolecular hydrogen bonding in ethanol.
Tap an option to check your answer.
Alcohols and Phenols - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.16Assertion (A) : The bond angle C – O – C in ethers is slightly greater than tetrahedral angle. Reason (R) : This is because of the repulsive interaction between the two bulky alkyl groups.
Tap an option to check your answer.
Ethers - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.16Assertion (A) : Phenol is strongly acidic as compared to ethanol. Reason (R) : Phenoxide ion is more stable than ethoxide ion.
Tap an option to check your answer.
Alcohols and Phenols - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.16Assertion (A) : Phenol is less acidic than alcohol. Reason (R) : Phenoxide ion is more stable than alkoxide ion.
Tap an option to check your answer.
Alcohols and Phenols - 20Explain the mechanism of acid catalysed hydration of ethene.Alcohols and Phenols
- 20Write the mechanism of dehydration of ethyl alcohol with conc. at 413 K.Ethers
- 20Write the mechanism of dehydration of ethyl alcohol with conc. at 443 K.Alcohols and Phenols
- 22(a) Can sodium methoxide and t-butyl bromide be used for the preparation of t-butyl methyl ether. Give suitable reason. Justify your answer by suggesting the appropriate starting material if required for the preparation of t-butyl methyl ether. (b) Give the IUPAC name of above mentioned ether.Ethers
- 26(a) Can sodium propoxide and t-butyl chloride be used for the preparation of t-butyl propyl ether ? Give suitable explanation. Justify your answer by suggesting the appropriate starting material required for the preparation of t-butyl propyl ether. (b) Give the IUPAC name of the above mentioned ether.Ethers
- 26(a) Write the chemical equation for Williamson's synthesis. (b) Give a method to separate -nitrophenol and -nitrophenol. Explain the principle involved.Alcohols and Phenols
- 26(a) Write the chemical equation for the following : (i) Preparation of phenol from cumene (ii) Nitration of anisole (b) Complete the following :Ethers
- 26Write structure of the products of the following reactions : (a) (b) (c)Alcohols and Phenols
- 26(a) Arrange the following compounds in the increasing order of their acidic strength : 3,5-dinitrophenol, 4-methylphenol, phenol, 2,4,6-trinitrophenol (b) What happens when : (write equations) (i) Phenol is distilled with Zn dust ? (ii) Anisole is treated with HBr ?Alcohols and Phenols
- 28(a) Can sodium ethoxide and t-butyl chloride be used for the preparation of t-butyl ethyl ether ? Give suitable explanation. Justify your answer by suggesting the appropriate starting material required for preparation of t-butyl ethyl ether. (b) Give the IUPAC name of above mentioned ether.Ethers
- Alcohols undergo a number of reactions involving the cleavage of C – OH bond. However, phenols do not undergo reactions involving the cleavage of C – OH bond. Alcohols are weaker acids than water. Alcohols react with halogen acids to form the corresponding haloalkanes. Phenols are stronger acids than alcohols. A characteristic feature of phenols is that they undergo electrophilic substitution reactions such as halogenation, nitration, etc. Since – OH group is a strong activating group, phenol gives trisubstituted products during halogenation, nitration, etc.29 (a)What happens when phenol is treated with the following ? (i) water (ii) Conc.Alcohols and Phenols
- Alcohols undergo a number of reactions involving the cleavage of C – OH bond. However, phenols do not undergo reactions involving the cleavage of C – OH bond. Alcohols are weaker acids than water. Alcohols react with halogen acids to form the corresponding haloalkanes. Phenols are stronger acids than alcohols. A characteristic feature of phenols is that they undergo electrophilic substitution reactions such as halogenation, nitration, etc. Since – OH group is a strong activating group, phenol gives trisubstituted products during halogenation, nitration, etc.29 (b) (i)Write the mechanism of alcohol reacting as nucleophile in a reaction with .Alcohols and Phenols
- Alcohols undergo a number of reactions involving the cleavage of C – OH bond. However, phenols do not undergo reactions involving the cleavage of C – OH bond. Alcohols are weaker acids than water. Alcohols react with halogen acids to form the corresponding haloalkanes. Phenols are stronger acids than alcohols. A characteristic feature of phenols is that they undergo electrophilic substitution reactions such as halogenation, nitration, etc. Since – OH group is a strong activating group, phenol gives trisubstituted products during halogenation, nitration, etc.29 (b) (ii)Why do phenols not undergo reactions involving cleavage of C – OH bond ?Alcohols and Phenols
- Alcohols undergo a number of reactions involving the cleavage of C – OH bond. However, phenols do not undergo reactions involving the cleavage of C – OH bond. Alcohols are weaker acids than water. Alcohols react with halogen acids to form the corresponding haloalkanes. Phenols are stronger acids than alcohols. A characteristic feature of phenols is that they undergo electrophilic substitution reactions such as halogenation, nitration, etc. Since – OH group is a strong activating group, phenol gives trisubstituted products during halogenation, nitration, etc.29 (c)How can you distinguish between Butan-1-ol and 2-Methylpropan-2-ol by using HCl in the presence of anhydrous ?Alcohols and Phenols
- Phenols undergo electrophilic substitution reactions readily due to the strong activating effect of OH group attached to the benzene ring. Since, the OH group increases the electron density more to o– and p– positions therefore OH group is ortho, para-directing. Reimer-Tiemann reaction is one of the examples of aldehyde group being introduced on the aromatic ring of phenol, ortho to the hydroxyl group. This is a general method used for the ortho-formylation of phenols.30 (a)What happens when phenol reacts with (i) (ii) Conc.Alcohols and Phenols
- Phenols undergo electrophilic substitution reactions readily due to the strong activating effect of OH group attached to the benzene ring. Since, the OH group increases the electron density more to o– and p– positions therefore OH group is ortho, para-directing. Reimer-Tiemann reaction is one of the examples of aldehyde group being introduced on the aromatic ring of phenol, ortho to the hydroxyl group. This is a general method used for the ortho-formylation of phenols.30 (b)Why phenol does not undergo protonation readily ?Alcohols and Phenols
- Phenols undergo electrophilic substitution reactions readily due to the strong activating effect of OH group attached to the benzene ring. Since, the OH group increases the electron density more to o– and p– positions therefore OH group is ortho, para-directing. Reimer-Tiemann reaction is one of the examples of aldehyde group being introduced on the aromatic ring of phenol, ortho to the hydroxyl group. This is a general method used for the ortho-formylation of phenols.30 (c)Which is a stronger acid - phenol or cresol ? Give reason.Alcohols and Phenols
- Phenols undergo electrophilic substitution reactions readily due to the strong activating effect of OH group attached to the benzene ring. Since, the OH group increases the electron density more to o– and p– positions therefore OH group is ortho, para-directing. Reimer-Tiemann reaction is one of the examples of aldehyde group being introduced on the aromatic ring of phenol, ortho to the hydroxyl group. This is a general method used for the ortho-formylation of phenols.30 (c) ORWrite the IUPAC name of the product formed in the Reimer-Tiemann reaction.Alcohols and Phenols
- 33 (A)An organic compound 'A', molecular formula oxidises with to form a compound 'B'. Compound 'B' on warming with iodine and aqueous solution of NaOH gives a yellow precipitate of compound 'C'. When compound 'A' is heated with conc. at 413 K gives a compound 'D', which on reaction with excess HI gives compound 'E'. Identify compounds 'A', 'B', 'C', 'D' and 'E' and write chemical equations involved.Alcohols and Phenols
- 33 (B)(a) Write chemical equations of the following reactions : (i) Phenol is treated with conc. (ii) Propene is treated with followed by oxidation by . (iii) Sodium t-butoxide is treated with . (b) Give a simple chemical test to distinguish between butan-1-ol and butan-2-ol. (c) Arrange the following in increasing order of acid strength : phenol, ethanol, waterAlcohols and Phenols
2024
41 q
- 2Which of the following compounds will give a ketone on oxidation with chromic anhydride ?
Tap an option to check your answer.
Alcohols and Phenols - 3Out of the following alkenes, the one which will produce tertiary butyl alcohol on acid catalysed hydration is
Tap an option to check your answer.
Alcohols and Phenols - 5Which of the following is most acidic ?
Tap an option to check your answer.
Alcohols and Phenols - 5Phenol is less acidic than :
Tap an option to check your answer.
Alcohols and Phenols - 5Which one of the following compounds has the lowest value ?
Tap an option to check your answer.
Alcohols and Phenols - 5Which of the following Grignard reagent will be used with methanal to prepare ?
Tap an option to check your answer.
Alcohols and Phenols - 5Which of the following is most acidic ?
Tap an option to check your answer.
Alcohols and Phenols - 5Which one of the following compounds has the highest value ?
Tap an option to check your answer.
Alcohols and Phenols - 6when treated with HI gives :
Tap an option to check your answer.
Ethers - 6Anisole reacts with HI to give :
Tap an option to check your answer.
Ethers - 6when treated with excess HI gives :
Tap an option to check your answer.
Ethers - 6reacts with HI to give :
Tap an option to check your answer.
Ethers - 6when treated with HI gives :
Tap an option to check your answer.
Ethers - 6reacts with HI to give :
Tap an option to check your answer.
Ethers - 7A compound (X) with the molecular formula can be oxidized by strong oxidizing agents to another compound (Y) whose molecular formula is . The compound (X) is :
Tap an option to check your answer.
Alcohols and Phenols - 7Ethanol on heating with conc. at 413 K gives :
Tap an option to check your answer.
Ethers - 7Visha took 4 test-tubes namely A, B, C & D containing , , and respectively and tried to convert them into tertbutylalcohol. She carried out acid catalysed hydration reaction on every alkene. Out of the four test-tubes, the one which will give desired result is
Tap an option to check your answer.
Alcohols and Phenols - 7Aspirin is formed by the acetylation of :
Tap an option to check your answer.
Alcohols and Phenols - 9Dehydration of tertiary alcohols with Cu at 573 K gives :
Tap an option to check your answer.
Alcohols and Phenols - 10The reaction of an alkyl halide with sodium alkoxide forming ether is known as :
Tap an option to check your answer.
Ethers - 10Which of the following species can act as the strongest base ?
Tap an option to check your answer.
Alcohols and Phenols - 10Phenol does not undergo nucleophilic substitution reaction easily due to :
Tap an option to check your answer.
Alcohols and Phenols - 11The correct order of the ease of dehydration of the following alcohols by the action of conc. is :
Tap an option to check your answer.
Alcohols and Phenols - 11The suitable Grignard reagent used for the synthesis of with methanal is :
Tap an option to check your answer.
Alcohols and Phenols - 11Match the reagents required for the given reactions : I. Oxidation of primary alcohols to aldehydes II. Butan-2-one to Butan-2-ol III. Bromination of Phenol to 2, 4, 6-Tribromophenol IV. Dehydration of propan-2-ol to propene (p) (q) 85% phosphoric acid at 440 K (r) PCC (s) Bromine water
Tap an option to check your answer.
Alcohols and Phenols - 11Phenol on reaction with aqueous bromine at room temperature gives :
Tap an option to check your answer.
Alcohols and Phenols - For questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :13Assertion (A) : p-nitrophenol is less acidic than phenol. Reason (R) : Nitro group is electron withdrawing and helps in the stabilisation of p-nitrophenoxide ion.
Tap an option to check your answer.
Alcohols and Phenols - For questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :13Assertion (A) : Bromination of Phenol can be carried out even in the absence of Lewis acid. Reason (R) : group of Phenol has the high activation effect.
Tap an option to check your answer.
Alcohols and Phenols - For questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :13Assertion (A) : Phenols are stronger acids than alcohols. Reason (R) : Alkoxide ion is more stable than phenoxide ion.
Tap an option to check your answer.
Alcohols and Phenols - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.15Assertion (A) : The boiling point of ethanol is higher than that of dimethyl ether. Reason (R) : Dimethyl ether molecules are associated through hydrogen bonding.
Tap an option to check your answer.
Alcohols and Phenols - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.15Assertion (A) : The boiling point of ethanol is higher than that of dimethyl ether. Reason (R) : Ethanol molecules are associated through hydrogen bonding whereas in dimethyl ether, it is not possible.
Tap an option to check your answer.
Alcohols and Phenols - For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.15Assertion (A) : Phenol on reaction with aqueous NaOH gives sodium phenoxide. Reason (R) : This reaction supports the acidic nature of phenol.
Tap an option to check your answer.
Alcohols and Phenols - For questions number 13 to 16, two statements are given one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :15Assertion (A) : p-methoxyphenol is a stronger acid than m-methoxy phenol. Reason (R) : Methoxy group exerts +R effect at both ortho and para position.
Tap an option to check your answer.
Alcohols and Phenols - For questions number 13 to 16, two statements are given one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :16Assertion (A) : p-methoxyphenol is a stronger acid than p-nitrophenol. Reason (R) : Methoxy group shows effect whereas nitro group shows effect.
Tap an option to check your answer.
Alcohols and Phenols - 23Give the structure of the major product expected from the following reactions : (a) Reaction of Ethanal with methyl-magnesium bromide followed by hydrolysis. (b) Hydration of But-1-ene in the presence of dilute sulphuric acid. (c) Reaction of phenol with bromine water.Alcohols and Phenols
- 24Give the equations of reactions for the preparation of : (any three) (a) Phenol from chlorobenzene (b) Salicylaldehyde from phenol (c) 2-Methoxyacetophenone from anisole (d) Picric acid from phenolAlcohols and Phenols
- 24(a) Write the reactions involved in the following : (i) Reimer-Tiemann reaction (ii) Kolbe's reaction (b) Name the reagent used in the bromination of phenol to form 2,4,6-Tribromophenol.Alcohols and Phenols
- 24Write chemical equations for the following reactions : (Do any three) (a) Hydroboration – oxidation reaction (b) Williamson Synthesis (c) Friedel-Crafts Alkylation of Anisole (d) Reimer-Tiemann ReactionAlcohols and Phenols
- 26(a) Write the mechanism of the following reaction : (b) Write the main product in each of the following reactions : (i) (ii) PhenolAlcohols and Phenols
- 26(a) Write the equations of the reactions involved in the following : (i) Reimer-Tiemann reaction (ii) Kolbe's reaction (b) Name the reagent used in the bromination of phenol to form 2,4,6-Tribromophenol.Alcohols and Phenols
- 27Give the structure of the major product expected from the following reactions : (a) Reaction of propanal with methyl magnesium bromide followed by hydrolysis. (b) Reaction of phenol with in . (c) Reaction of propene with diborane followed by oxidation.Alcohols and Phenols
2023
30 q
- 2Sodium phenoxide when heated with under pressure, followed by acidification, yields :
Tap an option to check your answer.
Alcohols and Phenols - 2Aspirin is obtained by the acetylation of which of the following compounds ?
Tap an option to check your answer.
Alcohols and Phenols - 2Which of the following alcohols will not undergo oxidation ?
Tap an option to check your answer.
Alcohols and Phenols - 4For the conversion of propene into 1-propanol, which of the following reagents and conditions should be used ?
Tap an option to check your answer.
Alcohols and Phenols - 6Which of the following alkenes on acid catalysed hydration gives a tertiary alcohol ?
Tap an option to check your answer.
Alcohols and Phenols - 7When diethyl ether is heated with excess of HI, it produces :
Tap an option to check your answer.
Ethers - 9Which of the following reactions are feasible ?
Tap an option to check your answer.
Ethers - 10In the reaction , what is the correct order of reactivity of alcohol ?
Tap an option to check your answer.
Alcohols and Phenols - 19Write the structures and IUPAC names of the products expected from the following reactions : (a) Reaction of methanal with followed by hydrolysis. (b) Reaction of phenol with conc. .Alcohols and Phenols
- 19Show how you will synthesise : (a) 1-Methylcyclohexan-1-ol from a suitable alkene. (b) Cyclohexylmethanol from methanal using a suitable Grignard reagent.Alcohols and Phenols
- 19Give the structures and IUPAC name of the products expected from the following reactions : (a) Reaction of methanal with followed by hydrolysis. (b) Reaction of phenol with (aq).Alcohols and Phenols
- 23 (a)Predict the products of the following reactions : (i) (ii)Alcohols and Phenols
- 23 (a)Account for the following : (i) Phenol is a stronger acid than an alcohol. (ii) The boiling point of alcohols decreases with increase in branching of alkyl chain.Alcohols and Phenols
- 23Write the mechanism of the following reaction :Alcohols and Phenols
- 23For the pair phenol and cyclohexanol, answer the following : (a) Why is phenol more acidic than cyclohexanol ? (b) Give one chemical test to distinguish between the two.Alcohols and Phenols
- 23Write the chemical equation involved in the following reactions : (a) Reimer-Tiemann reaction (b) Acetylation of Salicylic acidAlcohols and Phenols
- 23 (b)Give reasons for the following : (i) p-nitrophenol is more acidic than p-methylphenol. (ii) on reaction with gives alkene as the main product and not an ether.Alcohols and Phenols
- 24Which of the following is an appropriate set of reactants for the preparation of 1-methoxy-4-nitrobenzene and why ? (a) Sodium 4-nitrophenoxide (b) 4-BromonitrobenzeneEthers
- 23 (b)(i) Write the mechanism of the following reaction : (ii) Write the equation involved in Reimer-Tiemann reaction.Alcohols and Phenols
- 24Write the chemical equation involved in the following : (a) Kolbe's reaction (b) Williamson synthesisAlcohols and Phenols
- 26 (a)(i) Write the mechanism of the following reaction : (ii) Why ortho-nitrophenol is steam volatile while para-nitrophenol is not ?Ethers
- 26 (a)(i) Write hydroboration-oxidation reaction with an example. (ii) Write the products of the following reaction : Anisole (iii) Why is p-nitrophenol more acidic than phenol ?Alcohols and Phenols
- 26(a) Write the mechanism of the following reaction : (b) Write the equation of the reaction for the preparation of phenol from cumene.Alcohols and Phenols
- 26(a) Write the mechanism of the following reaction : (b) Write the structures of the products obtained by heating anisole with conc. .Alcohols and Phenols
- 26 (b)What happens when (i) Anisole is treated with /anhydrous ? (ii) Phenol is oxidised with ? (iii) is heated with Cu/573 K ? Write chemical equation in support of your answer.Alcohols and Phenols
- 26 (b)(i) What happens when phenol reacts with (1) Conc. , and (2) in presence of aqueous NaOH followed by acidification ? Write equations only. (ii) Why does the reaction of with give 2-methylpropene and not ?Alcohols and Phenols
- 28How do you convert the following : (Any three) (a) Phenol to 2-Hydroxybenzaldehyde (b) Anisole to 2-Methoxyacetophenone (c) Propene to Propan-2-ol (d) Ethanol to EthanalAlcohols and Phenols
- 28How do you convert the following : (Any three) (a) Phenol to picric acid (b) Propanone to 2-Methylpropan-2-ol (c) Phenol to anisole (d) Propene to Propan-1-olAlcohols and Phenols
- 30 (a)(i) Why is the C – O bond length in phenols less than that in methanol ? (ii) Arrange the following in order of increasing boiling point : Ethoxyethane, Butanal, Butanol, n-butane (iii) How can phenol be prepared from anisole ? Give reaction.Alcohols and Phenols
- 30 (b)(i) Give mechanism of the following reaction : (ii) Illustrate hydroboration – oxidation reaction with an example.Ethers
The 10 board questions to practise first
The questions the board asked again come first, most asked first. Each one says how often and when.
Question 1
Asked 3 times: 2023, 2024, 2026
6Aspirin is obtained by acetylation ofTap an option to check your answer.
Question 2
Asked 3 times: 2024, 2025*, 2026 (* = numbers or wording changed that year)
Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.13Assertion (A) : Ethers have lower boiling points than the boiling points of alcohols. Reason (R) : This is due to the presence of hydrogen bonding in alcohols.Tap an option to check your answer.
Question 3
Asked 3 times: 2023, 2024, 2025
20Write the mechanism of dehydration of ethyl alcohol with conc. at 443 K.Question 4
Asked 2 times: 2024, 2026
2Dehydration of tertiary alcohols with Cu at 573 K gives :Tap an option to check your answer.
Question 5
Asked 2 times: 2024*, 2026 (* = numbers or wording changed that year)
Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.15Assertion (A) : p-nitrophenol is more acidic than phenol. Reason (R) : Nitro group is an electron-withdrawing group, it stabilises phenoxide ion by dispersal of negative charge.Tap an option to check your answer.
Question 6
Asked 2 times: 2024*, 2026 (* = numbers or wording changed that year)
8on reaction with HI givesTap an option to check your answer.
Question 7
Asked 2 times: 2025, 2026
4Williamson synthesis is an example of :Tap an option to check your answer.
Question 8
Asked 2 times: 2024, 2026
27Write the reaction involved in the following : (a) Reimer-Tiemann reaction (b) Kolbe’s reaction (c) Friedal-Crafts acylation of anisoleQuestion 9
Asked 2 times: 2024, 2026
6Which of the following Grignard Reagent will be used to prepare cyclohexylmethanol when treated with methanal ?Tap an option to check your answer.
Question 10
Asked 2 times: 2025, 2026
8At low temperature, phenol on reaction with in givesTap an option to check your answer.