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Among formaldehyde, acetaldehyde, benzal...

Among formaldehyde, acetaldehyde, benzaldehyde and formic acid, which compounds undergo Cannzzaro reaction? Give reason.

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The correct Answer is:
Formaldehyde and benzaldehyde undergo Cannizzaro reaction, Aldehydes which do not have `alpha` hydrogen undergo Cannizzaro reaction. Formaldehyde and benazaldehyde do not have `alpha` hydrogen.
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