An 'Assertion' and a 'Reason' are given below. Choose the c…

Chemistry Haloalkanes and Haloarenes JEE Main 2019 Single Correct MCQ

Published on: August 13, 2026

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

Assertion

: Vinyl halides do not undergo nucleophilic substitution easily. Reason (R) : Even though the intermediate carbocation is stabilized by loosely held

-electrons, the cleavage is difficult because of strong bonding. Both

and

are wrong statements

Both

and

are correct statements and

is the correct explanation of

Both

and

are correct statements but

is not the correct explanation of

is a correct statement but

is a wrong statement.

Text Solution

Verified by Experts

The correct answer is:

Due to partial double bond character of -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.

Intermediate carbonation is not stabilized by loosely held- electrons because empty orbital, being at , cannot overlap with -orbitals of bond. So, reason is wrong.