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Carboxylic acids contain carbonyl group ...

Carboxylic acids contain carbonyl group but do not show the nucleophilic addition reactions like aldehydes or ketones. Why?

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No doubt, the carboxylic acids contain a carbonyl group but it is a part of carboxyl group and is involved in resonance.

This means that the carbon atom of the carbonyl group is not in a position to accommodate the attacking nucleophile. Therefore, carboxylic acids donot participate in the nuclephilic addition reactions whereas both aldehydes and ketones do participate. For more details, consult section 16.
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Assertion : Carboxylic acids contain a carbonyl group but donot give the characteristic reactions of the group. Reason : The electrophilicity of the carbon atom is more in carboxylic acids than in aldehydes and ketones.

Ketones give nucleophilic addition reactions more readily than aldehydes.

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