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

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

(a) Methanal > Ethanal > Acetone

(b) Acetone > Ethanal > Methanal

(c) Methanal > Acetone > Ethanal

(d) Ethanal > Methanal > Acetone

The question was asked in examination.

I want to ask this question from Aldehydes and Ketones Chemical Reactions topic in section Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

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Correct choice is (a) Methanal > Ethanal > Acetone

Best explanation: 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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