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Question

Which of the following acids can be oxidised by Fehling solution?
  1. Acetic acid
  2. Malonic acid
  3. Formic acid
  4. Oxalic acid


Solution

The correct option is C 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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