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Haloalkanes and Haloarenes · Question 12

JEE Main 2026 (Online) 22nd January Morning ShiftMCQHard📈 Topic in 13% papers+4−1
1

The correct order of the rate of reaction of the following reactants with nucleophile by SN1 mechanism is : (Given : Structures I and II are rigid) [figure]

  1. I < II < III < IV
  2. II < I < III < IV
  3. III < I < II < IV
  4. IV < III < II < I

Answer

(2) II < I < III < IV

Solution

Rate of an SN1 reaction stability of the carbocation formed.

IV: Ph3C+ (trityl cation) is stabilised by resonance with three benzene rings fastest.

III: (CH3)3C+ is a planar 3° carbocation stabilised by hyperconjugation and +I effect.

I and II: Br is on a bridgehead carbon. A carbocation needs a planar (sp2) carbon, which a rigid bridgehead cannot attain these cations are very unstable and react very slowly.

II (bicyclo[2.2.1]heptane, one-carbon bridge) is more strained and further from planarity than I (bicyclo[2.2.2]octane) II is the slowest.

Order of rate: II < I < III < IV

Answer: (2)

JEE Main 2026 (Online) 22nd January Morning Shift

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2

The correct order of reactivity of CH3Br in methanol with the following nucleophiles is F-, I-, C2H5O- and C6H5O-

  1. I- > C2H5O- > C6H5O- > F-
  2. I- > F- > C6H5O- > C2H5O-
  3. I- > C6H5O- > F- > C2H5O-
  4. I- > C2H5O- > F- > C6H5O-
JEE Main 2026 (Online) 22nd January Morning Shift
3

The correct order of the rate of the reaction for the following reaction with respect to nucleophiles is : CH3Br + Nu- CH3Nu + Br-

  1. ClO4- > CH3COO- > OH- > PhO-
  2. OH- > PhO- > CH3COO- > ClO4-
  3. CH3COO- > PhO- > OH- > ClO4-
  4. PhO- > OH- > CH3COO- > ClO4-
JEE Main 2026 (Online) 21st January Evening Shift
4

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
JEE Main 2026 (Online) 21st January Evening Shift
5

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
6

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
7

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
8

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
9

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
10

[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
11

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

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