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**Cannizzaro's reaction** is given by aldehydes that have
Ano $\alpha$-hydrogen
Btwo $\alpha$-hydrogens
Conly aromatic aldehydes
Done $\alpha$-hydrogen
Answer & Solution
Correct answer: A. no $\alpha$-hydrogen
Cannizzaro is the disproportionation pathway taken by aldehydes WITHOUT $\alpha$-H (e.g. HCHO, $C_6H_5CHO$, $(CH_3)_3CCHO$), since they cannot enolise. With $\alpha$-H, aldol dominates.
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