Which of the following is the least reactive towards nucleophillic addition reaction?

C H_{3} C H O

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C H_{3} C O C H_{3}

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C H_{3} C O O H

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H C H O

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Solution

The correct option is C $C H_{3} C O O H$
The electrophilicity of carbonyl carbon of aldehyde is more than ketone because in ketone two R groups will minimise the electrophilicity due to inductive effect. But the electrophilicity of carboxylic carbon is greatly diminished due to resonance, thus the electrophilicity is least in case of carboxylic carbon. Hence $C H_{3} C O O H$ will be least reactive towards nucleophilic addition reaction.

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