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  4. By the action of concentrated sodium hydroxide on benzaldehyde, the benzyl alcohol and sodium benzoate is obtained . This reaction is known as

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Q. By the action of concentrated sodium hydroxide on benzaldehyde, the benzyl alcohol and sodium benzoate is obtained . This reaction is known as

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Solution:

Benzaldehyde on treatment with 50% aqueous or ethanolic alkali solution undergoes Cannizzaro’s reaction like $HCHO$ (no $\alpha -$ hydrogen atom) i.e., one molecule is oxidised and one is reduced with the formation of benzoic acid and benzyl alcohol respectively.