Organic Reaction Mechanisms

JEE Mains Chemistry. Try each one first, then open its answer.

Top 10 JEE Mains PYQs to practise first

The questions and kinds of question asked most often come first. Each one says how often and in which papers.

This type asked 4 times: 2021 Paper 26, 1 Feb 2023, 8 Apr 2024, 9 Apr 2024. This one: 9 Apr 2024 See all 4 of this type

125

Br_{2}

	LIST-I (Test)		LIST-II (Observation)
A.	$Br_{2}$ water test	I.	Yellow orange or orange red precipitate formed
B.	Ceric ammonium nitrate test	II.	Reddish orange colour disappears
C.	Ferric chloride test	III.	Red colour appears
D.	2,4-DNP test	IV.	Blue, Green, Violet or Red colour appear

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This type asked 2 times: 2021 Paper 26, 2 Apr 2025. This one: 2 Apr 2025 See all 2 of this type

116

2C_{6}H_{5}X + 2Na \xrightarrow{\text{dry ether}} C_{6}H_{5}-C_{6}H_{5} + 2NaX

	List-I (Reaction)		List-II (Name of reaction)
(A)	$2C_{6}H_{5}X + 2Na \xrightarrow{\text{dry ether}} C_{6}H_{5}-C_{6}H_{5} + 2NaX$	(I)	Lucas reaction
(B)	$ArN_{2}^{+}X^{-} \xrightarrow{Cu,\ HCl} ArCl + N_{2} \uparrow + CuX$	(II)	Finkelstein reaction
(C)	$C_{2}H_{5}Br + NaI \xrightarrow{\text{dry acetone}} C_{2}H_{5}I + NaBr$	(III)	Fittig reaction
(D)	$CH_{3}C(OH)(CH_{3})CH_{3} \xrightarrow{HCl,\ ZnCl_{2}} CH_{3}C(Cl)(CH_{3})CH_{3}$	(IV)	Gattermann reaction

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Question 3
Asked once: 8 Apr 2024 (same type asked 4 times) See all 4 of this type
128 $Match List-I with List-II. List-I (Test) List-II (Identification) (A) Baeyer's test (I) Phenol (B) Ceric ammonium nitrate test (II) Aldehyde (C) Phthalein dye test (III) Alcoholic -OH group (D) Schiff's test (IV) Unsaturation Choose the correct answer from the options given below :$
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Asked once: 2021 Paper 26 (same type asked 2 times) See all 2 of this type

C_{6}H_{5}N_{2}^{+}Cl^{-} \xrightarrow{Cu_{2}Cl_{2}} C_{6}H_{5}Cl + N_{2}

	List-I		List-II
(A)	$C_{6}H_{5}N_{2}^{+}Cl^{-} \xrightarrow{Cu_{2}Cl_{2}} C_{6}H_{5}Cl + N_{2}$	(i)	Wurtz reaction
(B)	$C_{6}H_{5}N_{2}^{+}Cl^{-} \xrightarrow{Cu,\ HCl} C_{6}H_{5}Cl + N_{2}$	(ii)	Sandmeyer reaction
(C)	$2CH_{3}CH_{2}Cl + 2Na \xrightarrow{\text{ether}} C_{2}H_{5}-C_{2}H_{5} + 2NaCl$	(iii)	Fittig reaction
(D)	$2C_{6}H_{5}Cl + 2Na \xrightarrow{\text{ether}} C_{6}H_{5}-C_{6}H_{5} + 2NaCl$	(iv)	Gattermann reaction

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Question 5
Asked once: 1 Feb 2023 (same type asked 4 times) See all 4 of this type
49 $Match List I with List II List I (Test) List II (Functional group / Class of Compound) (A) Molisch's Test (I) Peptide (B) Biuret Test (II) Carbohydrate (C) Carbylamine Test (III) Primary amine (D) Schiff's Test (IV) Aldehyde Choose the correct answer from the options given below:$
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Question 6
Asked once: 2021 Paper 26 (same type asked 4 times) See all 4 of this type
39 $CHCl_{3}$
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Question 7
Asked once: 8 Apr 2026 S2
38 $The major product of which of the following reaction is not obtained by rearrangement reaction?$
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	List I (Test)	List II (Functional group / Class of Compound)
(A)	Molisch's Test	(I) Peptide
(B)	Biuret Test	(II) Carbohydrate
(C)	Carbylamine Test	(III) Primary amine
(D)	Schiff's Test	(IV) Aldehyde

Asked once: 4 Apr 2026 S2

Match the LIST-I with LIST-II List-I Reaction List-II Mechanism (A) Williamson Synthesis (I) Electrophilic addition (B) Friedel-Crafts reaction (II) Free radical substitution (C) Bromination of vinyl benzene (III) Nucleophilic substitution (D) Chlorination of toluene in light (IV) Electrophilic substitution Choose the correct answer from the options given below:

	List-I Reaction		List-II Mechanism
(A)	Williamson Synthesis	(I)	Electrophilic addition
(B)	Friedel-Crafts reaction	(II)	Free radical substitution
(C)	Bromination of vinyl benzene	(III)	Nucleophilic substitution
(D)	Chlorination of toluene in light	(IV)	Electrophilic substitution

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Question 9
Asked once: 23 Jan 2026 S1
29 $The correct sequence of reagents for the above conversion of X to Y is :$
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Question 10
Asked once: 7 Apr 2025
125 $sp^{2}$