JEE Main Chemistry question

In a Cannizzaro's reaction, the combination not possible is

(A)HCHO + HCHO
(B)C₆H₅CHO + HCHO
(C)CH₃CHO + HCHOCorrect
(D)A diformyl-cyclic aromatic dialdehyde (both carbonyls lacking α-H)

Answer: (C)

Solution

Cannizzaro's reaction (self or crossed) requires that at least the aldehydes directly undergoing disproportionation at a given carbonyl each individually lack an α-hydrogen. Formaldehyde and benzaldehyde both qualify (no α-H), so HCHO+HCHO, C₆H₅CHO+HCHO, and a dialdehyde lacking α-H on both carbonyls are

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Question ID VK-149366