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Haloalkanes and Haloarenes · Question 15

JEE Main 2026 (Online) 21st January Evening ShiftMCQMedium📈 Topic in 13% papers+4−1
1

The correct order of reactivity of the following benzyl halides towards reaction with KCN is : [figure]

  1. a > b > c > d
  2. b > a > d > c
  3. b > a > c > d
  4. a > b > d > c

Answer

(2) b > a > d > c

Solution

Benzyl halides undergo nucleophilic substitution with KCN in a polar (protic) medium mainly through the SN1 path, i.e. via a benzylic carbocation Ar CH2.

Rate stability of the benzylic carbocation.

Electron-releasing (+R) groups at the para position stabilise the carbocation; electron-withdrawing groups destabilise it.

b: p-NH2 – strongest +R effect (N is less electronegative than O) most stable carbocation

a: p-OH – +R effect, weaker than –NH2

d: m-NO2 – only –I effect (–R does not operate from the meta position)

c: p-NO2 – both –R and –I effects least stable carbocation

Reactivity: b > a > d > c

Answer: (2)

JEE Main 2026 (Online) 21st January Evening Shift

Keep practising — Haloalkanes and Haloarenes

2

The reactions which cannot be applied to prepare an alkene by elimination, are Choose the correct answer from the options given below:

  1. B & E Only
  2. B, C & D Only
  3. A, C & D Only
  4. B & D Only
JEE Main 2025 (Online) 7th April Morning Shift
3

Match List - I with List - II. Choose the correct answer from the options given below :

  1. A-II, B-III, C-I, D-IV
  2. A-III, B-IV, C-II, D-I
  3. A-IV, B-III, C-I, D-II
  4. A-IV, B-III, C-II, D-I
JEE Main 2025 (Online) 7th April Evening Shift
4

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Both Statement I and Statement II are incorrect
  2. Both Statement I and Statement II are correct
  3. Statement I is incorrect but Statement II is correct
  4. Statement I is correct but Statement II is incorrect
JEE Main 2025 (Online) 4th April Evening Shift
5

In the following series of reactions identify the major products A & B respectively : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 3rd April Evening Shift
6

Match List-I with List-II. Choose the correct answer from the options given below:

  1. (A)-(III), (B)-(II), (C)-(IV), (D)-(I)
  2. (A)-(IV), (B)-(III), (C)-(I), (D)-(II)
  3. (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
  4. (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
JEE Main 2025 (Online) 2nd April Evening Shift
7

[figure] Consider the above sequence of reactions. 151 g of 2-bromopentane is made to react. Yield of major product P is 80\% whereas Q is 100\%. Mass of product Q obtained is g. (Given molar mass in g mol-1 H : 1, C : 12, O : 16, Br : 80)

JEE Main 2025 (Online) 2nd April Evening Shift
8

In the following substitution reaction : [figure] Product 'P' formed is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 29th January Morning Shift
9

The products A and B in the following reactions, respectively are A AgNO2 CH3-CH2-CH2-Br AgCN B

  1. CH3-CH2-CH2-ONO, CH3-CH2-CH2-CN
  2. CH3-CH2-CH2-NO2, CH3-CH2-CH2-CN
  3. CH3-CH2-CH2-ONO, CH3-CH2-CH2-NC
  4. CH3-CH2-CH2-NO2, CH3-CH2-CH2-NC
JEE Main 2025 (Online) 28th January Morning Shift
10

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below

  1. Both Statement I and Statement II are correct
  2. Statement I is incorrect but Statement II is correct
  3. Both Statement I and Statement II are incorrect
  4. Statement I is correct but Statement II is incorrect
JEE Main 2025 (Online) 28th January Morning Shift
11

The product B formed in the following reaction sequence is: [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 28th January Evening Shift

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