Which of the following undergo the Cannizzaro reaction on heating with concentrated NaOH? (One or more answers)

A4-chlorobenzaldehyde
Bpropanal
C2,2-dimethylpropanal
Dcyclohexanone

Answer: A, C

Cannizzaro reaction requires an aldehyde without alpha-hydrogen. 4-Chlorobenzaldehyde and 2,2-dimethylpropanal qualify. Propanal has alpha-hydrogens and gives aldol products, and cyclohexanone is a ketone with alpha-hydrogens.

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