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Haloalkanes and Haloarenes

JEE Main 2025 (Online) 4th April Evening ShiftMCQEasy📈 Topic in 15% papers+4−1
Ques. 1JEE Main 2025, 4 April (Evening 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 incorrect but Statement II is correct
  4. Statement I is correct but Statement II is incorrect

Answer

(3) Statement I is incorrect but Statement II is correct

Solution

Statement I: With aqueous KOH, OH- replaces Cl by nucleophilic substitution:

R-Cl + KOH(aq) R-OH + KCl

Alcohols are formed by substitution, not by elimination Statement I is incorrect.

Statement II: Alcoholic KOH (alkoxide/hydroxide acting as a base) removes an H from the β-carbon and Cl- leaves from the α-carbon (β-elimination, dehydrohalogenation):

CH3-CH2-Cl alc. KOH, CH2=CH2 + KCl + H2O

Statement II is correct.

Answer: (3)

Keep practising — Haloalkanes and Haloarenes

Ques. 2JEE Main 2025, 3 April (Evening Shift)

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 3JEE Main 2025, 2 April (Evening Shift)

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)
Ques. 4JEE Main 2025, 2 April (Evening Shift)

[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)

Ques. 5JEE Main 2025, 29 January (Morning Shift)

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 6JEE Main 2025, 29 January (Evening Shift)

Which among the following halides will generate the most stable carbocation in the nucleophilic substitution reaction?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 7JEE Main 2025, 28 January (Morning Shift)

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
Ques. 8JEE Main 2025, 28 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 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
Ques. 9JEE Main 2025, 28 January (Evening Shift)

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10JEE Main 2025, 28 January (Evening Shift)

The major product of the following reaction is: [figure]

  1. 6-Phenylhepta-3,5-diene
  2. 6-Phenylhepta-2,4-diene
  3. 2-Phenylhepta-2,4-diene
  4. 2-Phenylhepta-2,5-diene
Ques. 11JEE Main 2025, 24 January (Morning Shift)

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

  1. Statement I is false but Statement II is true
  2. Statement I is true but Statement II is false
  3. Both Statement I and Statement II are false
  4. Both Statement I and Statement II are true

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