Which of the following acids can be oxidised by Fehling solution?

Malonic acid

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Acetic acid

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Oxalic acid

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Formic acid

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Solution

The correct option is D Formic acid
Fehling's test is a distingushing test of aldehydes and ketones. It selectively oxidises aldehydes over ketone. Since in formic acid instead of alkyl group we have a hydrogen atom. Thus, Fehling's solution oxidises formic acid to carbonic acid.

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