Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : Aryl halides cannot be prepared by replacement of hydroxyl group of phenol by halogen atom. Reason R: Phenols react with halogen acids violently. In the light of the above statements, choose the most appropriate from the options given below:
(A)Both A and R are true but R is NOT the correct explanation of A
(B)A is false but R is true
(C)A is true but R is false✓ Correct
(D)Both A and R are true and R is the correct explanation of A
Answer: (C)
Solution
Assertion A is true: the C-O bond in phenol has partial double-bond character from conjugation with the ring, so its hydroxyl group cannot be replaced by a halogen through reaction with a hydrohalic acid.
Reason R (phenols react with halogen acids violently) is false -- in fact phenols essentially do not react with HX under ordinary conditions; there is no such reaction, violent or otherwise.
Key confirmed: C (A is true but R is false).
JEE Main · 2024 · 29 Jan 2024 · Shift 1 · Single correct option
