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Haloalkanes and Haloarenes

JEE Main 2025 (Online) 28th January Evening ShiftMCQMedium📈 Topic in 15% papers+4−1
Ques. 1JEE 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

Answer

(3) 2-Phenylhepta-2,4-diene

Solution

The substrate is CH3-CH(C6H5)-CHBr-CH2-CHBr-CH2-CH3, i.e. 3,5-dibromo-2-phenylheptane (C-1 = the methyl on the benzylic carbon).

Excess alcoholic KOH with heat removes two molecules of HBr (two β-eliminations).

Elimination at C-3: the β-H on C-2 is benzylic and tertiary; removing it gives the more substituted double bond C2=C3 that is also conjugated with the benzene ring (Saytzeff product, extra resonance stability).

Elimination at C-5: a β-H can come from C-4 or C-6; removing it from C-4 gives C4=C5, which is conjugated with C2=C3 (conjugated diene is more stable).

Product: CH3-C(C6H5)=CH-CH=CH-CH2-CH3, a fully conjugated system (ring + C2=C3 + C4=C5).

IUPAC name: 2-Phenylhepta-2,4-diene.

Answer: (3)

Keep practising — Haloalkanes and Haloarenes

Ques. 2JEE 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
Ques. 3JEE Main 2025, 24 January (Evening Shift)

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 4JEE Main 2025, 23 January (Morning Shift)

Match the 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-II, B-I, C-III, D-IV
  3. A-IV, B-I, C-III, D-II
  4. A-IV, B-III, C-I, D-II
Ques. 5JEE 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)
Ques. 6JEE 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. 7JEE 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
Ques. 8JEE Main 2024, 9 April (Morning Shift)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
  2. Both (A) and (R) are correct and (R) is the correct explanation of (A)
  3. (A) is not correct but (R) is correct
  4. (A) is correct but (R) is not correct
Ques. 9JEE Main 2024, 9 April (Morning Shift)

In the following sequence of reactions, the major products B and C respectively are : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10JEE Main 2024, 9 April (Evening Shift)

[figure] In the above reaction product 'P' is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 11JEE Main 2024, 8 April (Morning Shift)

Which among the following compounds will undergo fastest SN2 reaction.

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

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