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(A) The reactivity of carbonyl compounds towards nucleophilic addition depends on two factors: steric hindrance and electronic effects.$1$. Steric hin

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$HCHO > CH_3CHO > CH_3COCH_3$

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(A) The reactivity of carbonyl compounds towards nucleophilic addition depends on two factors: steric hindrance and electronic effects.$1$. Steric hindrance: As the number of alkyl groups attached to the carbonyl carbon increases,the attack of the nucleophile becomes more difficult due to crowding.$2$. Electronic effect: Alkyl groups are electron-donating ($+I$ effect),which decreases the electrophilicity of the carbonyl carbon.Comparing the given compounds:- $HCHO$ (Formaldehyde): No alkyl groups,least steric hindrance,most electrophilic.- $CH_3CHO$ (Acetaldehyde): One methyl group,moderate steric hindrance.- $CH_3COCH_3$ (Acetone): Two methyl groups,highest steric hindrance,least electrophilic.Therefore,the order of reactivity is $HCHO > CH_3CHO > CH_3COCH_3$.

Which of the following represents the correct order of reactivity towards nucleophilic addition reactions?

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