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Which one of the following cannot give positive Fehling's test

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${CH}_{3} {CH}_{2} CHO$

$HCOOH$

Both 2 and 3

$C_{6} H_{5} CHO$

answer is B.

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Detailed Solution

Benzaldehyde is an aromatic aldehyde. It cannot give ppt with Fehling's reagent but gives ppt with Tollen's reagent.

HCOOH gives most of the properties of aldehydes as it contains -CHO group. It gives a ppt of cuprous oxide with Fehling's reagent where itself oxidizes to carbon dioxide..

Propanal is an aliphatic aldehyde and thus gives positive Fehling's test.

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