Out of the following the one that undergoes reaction with 50% NaOH solution to give corresponding alcohol and acid is:

phenol

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benzaldehyde

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butanol

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benzoic acid

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Solution

The correct option is D benzaldehyde
The reaction of benzaldehyde to form alcohol and acid can be written as:
$C_{6} H_{5} C H O N a O H - --- \to H_{3} O^{-} C_{6} H_{5} C O O H + C_{6} H_{5} C H_{2} O H$
The reaction is also called as Cannizzaro's reaction. This reaction can be given by only those aldehyde which does not contain alpha carbon.

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