JEE Main Chemistry question

Statement 1: Oxidation of toluene with chromyl chloride to get benzaldehyde is carried out in presence of acetic anhydride. Statement 2: Presence of a CH group in toluene activates the benzene ring.

(A)Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
(B)Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1Correct
(C)Statement 1 is True, Statement 2 is False
(D)Statement 1 is False, Statement 2 is True

Answer: (B)

Solution

Étard's oxidation of toluene's methyl group with chromyl chloride is carried out in acetic anhydride specifically because the anhydride traps the initially formed benzylidene–chromium complex as a stable diacetate, preventing the aldehyde from being over-oxidised to benzoic acid (Statement 1, true). Separately, the

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Question ID VK-142352