The test to distinguish $C_{6} H_{5} C H O$ and $C H_{3} C H O$ is

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Litmas test

Esterification test

Tollens test

Fehlings test

answer is A.

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Detailed Solution

On heating an aldehyde with Fehling’s reagent, a reddish brown precipitate is obtained. Aldehydes are oxidized to corresponding carboxylate anion. Aromatic aldehydes do not respond to this test.

Hence, $C_{6} H_{5} C H O$ and $C H_{3} C H O$ can be distinguished by Fehling's test.

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