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Q.

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

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a

CH3COCH3

b

CH3CH2CHO

c

HCHO

d

CH3CHO

answer is B.

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Detailed Solution

Rate of Nucleophilic Addition α  electrophilicity of carbonyl carbon

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Reactivity of Ketones < Aldehydes

Due +I effect and steric hindrance Ketones are less reactive

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+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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