JEE Main Chemistry question

Assertion (A): Benzoic acid does not give Friedel–Crafts reaction. Reason (R): Benzoic acid is obtained by catalytic oxidation of toluene with air in presence of a Co–Mn catalyst.

(A)Both A and R are true, and R is the correct explanation of A
(B)Both A and R are true, but R is NOT the correct explanation of ACorrect
(C)A is true, but R is false
(D)A is false, but R is true

Answer: (B)

Solution

The assertion is true: benzoic acid's ring is strongly deactivated by the electron-withdrawing –COOH group, so it does not undergo Friedel–Crafts reactions (electrophilic substitution requires a sufficiently activated ring, and a free carboxylic acid can also complex with and poison the Lewis acid catalyst). The

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Question ID VK-149528