Which of the following does not undergo Cannizzaro's reaction?

Benzaldehyde

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Acetaldehyde

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p-Methoxybenzaldehyde

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2,2-Dimethylpropanal

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Solution

The correct option is A Acetaldehyde
Aldehydes containing no $α - H$ atoms on heating with a concentrated alkali solution (50%)undergo Cannizzaro's reaction.

In this reaction, one molecule is oxidised at the expense of other which is reduced to an alcohol.

As $A c e t a l d e h y d e$ contains alpha hydrogen, hence it can't undergoes
Cannizzaro reaction.

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