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What is the correct order of reactivity of the following towards nucleophilic addition?

What is the correct order of reactivity of the following towards nucleophilic addition? Correct Answer Methanal > Ethanal > Acetone

Methanal is the most reactive among aldehydes and ketones due to electronic and stearic reasons. Methanal (HCHO) does not have any alkyl groups that release electrons toward carbonyl carbon, thus making it more electrophilic. Also, presence of only two H atoms do not provide any hinderance to the attack of incoming nucleophile.

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