Q.

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

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a

CH3CHO

b

HCHO

c

CH3COCH3

d

CH3CH2CHO

answer is B.

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Detailed Solution

Rate of Nucleophilic Addition α  electrophilicity of carbonyl carbonReactivity of Ketones < AldehydesDue +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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Which of the following carbonyl compound is most reactive towards nucleophilic addition reactions