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Which of the following is unable to reduce Fehling's solution?

1. Formic acid
2. Ethanoic acid
3. Methanal
4. Ethanal

Correct answer: Ethanoic acid

Solution

Ethanoic acid, being a carboxylic acid, does not have the ability to act as a reducing agent to reduce Fehling's solution, unlike the other options which contain aldehyde functional groups capable of reducing it.

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