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Haloalkanes and Haloarenes

JEE Main 2025 (Online) 23rd January Evening ShiftMCQMedium📈 Topic in 24% papers+4−1
Ques. 1JEE Main 2025, 23 January (Evening Shift)

The ascending order of relative rate of solvolysis of following compounds is : [figure]

  1. (C) < (D) < (B) < (A)
  2. (D) < (A) < (B) < (C)
  3. (D) < (B) < (A) < (C)
  4. (C) < (B) < (A) < (D)

Answer

(2) (D) < (A) < (B) < (C)

Solution

Solvolysis is SN1: faster the more stable the carbocation formed.

(D) secondary alkyl: hyperconjugation only:

[figure]

(A) tertiary: 3 alkyl groups, hyperconjugation + I effect:

[figure]

(B) secondary benzylic: resonance with one ring:

[figure]

(C) diphenylmethyl: resonance with two rings:

[figure]

Resonance (aryl) > hyperconjugation; two rings > one ring

∴ rate: (D) < (A) < (B) < (C)

Answer: (2)

Keep practising — Haloalkanes and Haloarenes

Ques. 2JEE Main 2025, 22 January (Morning Shift)

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 correct but Statement II is incorrect
  4. Statement I is incorrect but Statement II is correct
Ques. 3JEE Main 2025, 22 January (Evening Shift)

[figure] The maximum number of RBr producing 2-methylbutane by above sequence of reactions is . (Consider the structural isomers only)

  1. 5
  2. 3
  3. 4
  4. 1

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