Which of the following carbonyl compound is most reactive towards nucleophilic addition reactions

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${CH}_{3} {COCH}_{3}$

${CH}_{3} {CH}_{2} CHO$

$HCHO$

${CH}_{3} CHO$

answer is B.

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Detailed Solution

Rate of Nucleophilic Addition $α$ electrophilicity of carbonyl carbon

Reactivity of Ketones < Aldehydes

Due +I effect and steric hindrance Ketones are less reactive

+I effect of two alkyl groups decreases the electrophilicity of carbon.

Presence two alkyl groups on carbonyl carbon increases the steric hindrance.

$∴$ Most reactive unsubstituted carbonyl compound towards nucleophilic addition is HCHO.

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