(A) Aromatic carboxylic acids do not undergo Friedel-Crafts reaction.
(R) Strongly deactivating groups such as ${NO}_{2}, CHO, COOH, \overset{+}{{NR}_{3}}, \overset{+}{{NH}_{3}}, {CCl}_{3}$
attached to benzene ring, decreases nucleophilicity of benzene

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Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

(A) is true but (R) is false

answer is A.

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Detailed Solution

Aromatic carboxylic acids do not undergo Friedel-Crafts reaction as the carboxyl (−COOH) group is deactivating and Lewis acid catalyst AlCl₃ gets bonded to the carboxyl group. The carboxyl (−COOH) group withdraws electron density from benzene ring through inductive and resonance effects.

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