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(A) Reactivity towards nucleophilic addition reactions depends on steric and electronic factors. As the number and size of alkyl groups attached to th

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$I > II > III > IV$

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(A) Reactivity towards nucleophilic addition reactions depends on steric and electronic factors. As the number and size of alkyl groups attached to the carbonyl carbon increase,the reactivity decreases due to the $+I$ effect (which reduces the electrophilicity of the carbonyl carbon) and increased steric hindrance. $HCHO$ has no alkyl groups,$CH_3CHO$ has one methyl group,$CH_3COCH_3$ has two methyl groups,and $CH_3CH_2COCH_2CH_3$ has two larger ethyl groups. Therefore,the correct decreasing order of reactivity is: $I > II > III > IV$.

Arrange the following compounds in decreasing order of reactivity towards nucleophilic addition reactions:
$(I) \ HCHO$,$(II) \ CH_3CHO$,$(III) \ CH_3COCH_3$,$(IV) \ CH_3CH_2COCH_2CH_3$

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Arrange the following compounds in decreasing order of reactivity towards nucleophilic addition reactions: $(I) \ HCHO$,$(II) \ CH_3CHO$,$(III) \ CH_3COCH_3$,$(IV) \ CH_3CH_2COCH_2CH_3$