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Carboxylic acids contain carbonyl group ...

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

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Carboxylic acids contain carbonyl group but do not show the reactions of carbonyl group such as nucleophilic addition reaction shown by aldehydes and ketones. The presence of lone pair of electrons on the O-atom of OH group decreases the electrophilic character of carbonyl carbon by resonance, hene the partial positive charge on carbonyl carbon atom is reduced and therefore, they do not show nucleophilic addition reactions.
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