Chemistry · Textbook solutions

Hydrocarbons

Every solved example, exercise, and miscellaneous question — in the order the textbook teaches them. · 35 questions

Exercise

35 q

1. Choose correct options

Practice · 5
  1. Choose correct options.
    Ex Q.1 (A)
    Which of the following compound has highest boiling point ?
    1. A.
      n-pentane
    2. B.
      iso-butane
    3. C.
      butane
    4. D.
      neopentane
  2. Ex Q.1 (B)
    Acidic hydrogen is present in :
    1. A.
      acetylene
    2. B.
      ethane
    3. C.
      ethylene
    4. D.
      dimethyl acetylene
  3. Ex Q.1 (C)
    Identify 'A' in the following reaction: CH3−C(CH3)=CH2\mathrm{CH_3-C(CH_3)=CH_2} → A \xrightarrow{\ A\ } CH3−CO−CH3+CO2+H2O\mathrm{CH_3-CO-CH_3 + CO_2 + H_2O}
    1. A.
      KMnO4/H+\mathrm{KMnO_4/H^+}
    2. B.
      alkaline KMnO4\mathrm{KMnO_4}
    3. C.
      dil. H2SO4\mathrm{H_2SO_4} / 1% HgSO4\mathrm{HgSO_4}
    4. D.
      NaOH/H2O2\mathrm{NaOH/H_2O_2}
  4. Ex Q.1 (D)
    Major product of chlorination of ethyl benzene is :
    1. A.
      m-chlorethyl benzene
    2. B.
      p - chloroethyl benzene
    3. C.
      chlorobenzene
    4. D.
      o - chloroethylbenzene
  5. Ex Q.1 (E)
    1 - chloropropane on treatment with alc. KOH produces :
    1. A.
      propane
    2. B.
      propene
    3. C.
      propyne
    4. D.
      propyl alcohol

2. Name the following

Practice · 18
  1. Name the following :
    Ex Q.2 (A)
    The type of hydrocarbon that is used as lubricant.
  2. Ex Q.2 (B)
    Alkene used in the manufacture of polythene bags.
  3. Ex Q.2 (C)
    The hydrocarbon said to possess carcinogenic property.
  4. Ex Q.2 (D)
    What are the main natural sources of alkane?
  5. Ex Q.2 (E)
    Arrange the three isomers of alkane with malecular formula C5H12\mathrm{C_5H_{12}} in increasing order of boiling points and write their IUPAC names.
  6. Ex Q.2 (F)
    Write IUPAC names of the products obtained by the reaction of cold concentrated sulphuric acid followed by water with the following compounds. a. propene b. but-l-ene
  7. Ex Q.2 (G)
    Write the balanced chemical reaction for preparation of ethane from a. Ethyl bromide b. Ethyl magnesium iodide
  8. Ex Q.2 (H)
    How many monochlorination products are possible for a. 2-methylpropane ? b. 2-methylbutane ? Draw their structures and write their IUPAC names.
  9. Ex Q.2 (I)
    Write all the possible products for pyrolysis of butane.
  10. Ex Q.2 (J)
    Which of the following will exhibit geometical isomerism ? a. CH3−CH2−C(=CH2)−CH3\mathrm{CH_3-CH_2-C(=CH_2)-CH_3} b. (CH3)2C=CH2\mathrm{(CH_3)_2C=CH_2} c. CH3−C(C2H5)=C(C2H5)−CH3\mathrm{CH_3-C(C_2H_5)=C(C_2H_5)-CH_3}
  11. Ex Q.2 (K)
    What is the action of following on ethyl iodide ? a. alc, KOH b. Zn, HCl
  12. Ex Q.2 (L)
    An alkene 'A' an ozonolysis gives 2 moles of ethanal. Write the structure and IUPAC name of 'A'.
  13. Ex Q.2 (M)
    Acetone and acetaldehyde are the ozonolysis products of an alkene. Write the structural formula of an alkene and give IUPAC name of it.
  14. Ex Q.2 (N)
    Write the reaction to convert a. propene to nypropylalcohol. b. propene to isoproyl alcohol.
  15. Ex Q.2 (O)
    What is the action of following on but-2-ene ? a. dil alkaline KMnO4\mathrm{KMnO_4} b. acidic KMnO4\mathrm{KMnO_4}
  16. Ex Q.2 (P)
    Complete the following reaction sequence : HC≡CH\mathrm{HC \equiv CH} →LiNH2\xrightarrow{\mathrm{LiNH_2}} AA →CH3CH2Cl\xrightarrow{\mathrm{CH_3CH_2Cl}} BB →HBr\xrightarrow{\mathrm{HBr}} CC Comment on the acidic nature of B.
  17. Ex Q.2 (Q)
    Write the balanced chemical reactions to get benzene from a. Sodium benzoate. b. Phenol.
  18. Ex Q.2 (R)
    Predict the possible products of the following reaction. a. chlorination of nitrobenzene, b. sulfonation of chlorobenzene, c. bromination of phenol, d. nitration of toluene.

3. Identify the main product of the reaction

Practice · 4
  1. Identify the main product of the reaction.
    Ex Q.3 (a)
    CH3−CH2−CH3\mathrm{CH_3-CH_2-CH_3} →ΔO2\xrightarrow[\Delta]{\mathrm{O_2}} ?
  2. Ex Q.3 (b)
    CH3−CH(OH)−CH3\mathrm{CH_3-CH(OH)-CH_3} →373 K60% H2SO4\xrightarrow[373\ \mathrm{K}]{60\%\ \mathrm{H_2SO_4}} ?
  3. Ex Q.3 (c)
    HC≡C−CH3\mathrm{HC \equiv C-CH_3} →Pd-C/quinolineH2\xrightarrow[\text{Pd-C/quinoline}]{\mathrm{H_2}} ?
  4. Ex Q.3 (d)
    H−C−H+H2O\mathrm{H-C-H + H_2O} →1% HgSO440% H2SO4\xrightarrow[1\%\ \mathrm{HgSO_4}]{40\%\ \mathrm{H_2SO_4}} ?

4. Read the following reaction and answer the questions given below

Practice · 2
  1. Read the following reaction and answer the questions given below. CH3−C(CH3)=CH2+HBr\mathrm{CH_3-C(CH_3)=CH_2 + HBr} →benzoyl peroxide\xrightarrow{\text{benzoyl peroxide}} CH3−CH(CH3)−CH2Br\mathrm{CH_3-CH(CH_3)-CH_2Br}
    Ex Q.4 (a)
    Write IUPAC name of the product.
  2. Ex Q.4 (b)
    State the rule that governs formation of this product.

5. Identify A, B, C in the following reaction sequence

Practice · 1
  1. Ex Q.5
    Identify A, B, C in the following reaction sequence : CH3−CH=CH2\mathrm{CH_3-CH=CH_2} →room temperatureBr2/CCl4\xrightarrow[\text{room temperature}]{\mathrm{Br_2/CCl_4}} AA →Zn\xrightarrow{\mathrm{Zn}} BB →KMnO4dil. alka.\xrightarrow[\mathrm{KMnO_4}]{\text{dil. alka.}} CC

6. Identify giving reason whether the following compounds are aromatic or not

Practice · 1
  1. Ex Q.6
    Identify giving reason whether the following compounds are aromatic or not.

7. Name two reagents used for acylation of benzene

Practice · 1
  1. Ex Q.7
    Name two reagents used for acylation of benzene.

8. Read the following reaction and answer the questions given below

Practice · 3
  1. Read the following reaction and answer the questions given below. C6H6+CH3Cl\mathrm{C_6H_6 + CH_3Cl} →anhydrous AlCl3\xrightarrow{\text{anhydrous } \mathrm{AlCl_3}} C6H5−CH3+HCl\mathrm{C_6H_5-CH_3 + HCl}
    Ex Q.8 (A)
    Write the name of the reaction.
  2. Ex Q.8 (B)
    Identify the electrophile in it.
  3. Ex Q.8 (C)
    How is this electrophile generated?