An ‘Assertion’ and a ‘Reason’ are given below. Choose the correct answer from the following options:

Assertion (A): Vinyl halides do not undergo nucleophilic substitution easily.

Reason (R): Even though the intermediate carbocation is stabilized by loosely held π-electron, the cleavage is difficult because of strong bonding.

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JEE Mains Previous Paper 1 (Held On: 12 Apr 2019 Shift 2)
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  1. Both (A) and (R) are wrong statement.
  2. Both (A) and (R) are correct statement and (R) is the correct explanation of (A)
  3. Both (A) and (R) are correct statement but (R) is not the correct explanation of (A)
  4. (A) is a correct statement but (R) is a wrong statement

Answer (Detailed Solution Below)

Option 4 : (A) is a correct statement but (R) is a wrong statement
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JEE Main 04 April 2024 Shift 1
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Detailed Solution

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Concept:

Due to partial double bond character of C-halogen bond, halogen leaves with great difficulty, if at all it does, hence vinyl halides do not undergo nucleophilic substitution easily. So, assertion is correct.

An intermediate carbocation is not stabilized by loosely held π electron overlap with p-orbitals of π bond. So, the reason is wrong.
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