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

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$I > II > III > IV$

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(A) The reactivity of carbonyl compounds towards nucleophilic addition reactions depends on two factors: electronic effects and steric hindrance.$1$. Electronic effect: Alkyl groups are electron-donating ($+I$ effect),which decreases the electrophilicity of the carbonyl carbon.$2$. Steric hindrance: As the size of the alkyl groups attached to the carbonyl carbon increases,the approach of the nucleophile becomes more difficult.Comparing the compounds:$(I)$ $HCHO$: No alkyl groups,least steric hindrance,highest electrophilicity.$(II)$ $CH_3CHO$: One methyl group.$(III)$ $(CH_3)_2CO$: Two methyl groups.$(IV)$ $(Me_3C)_2CO$: Two very bulky tert-butyl groups,maximum steric hindrance.Therefore,the order of reactivity is $I > II > III > IV$.

What will be the order of reactivity of the following carbonyl compounds with a nucleophile?
$(I)$ $HCHO$
$(II)$ $CH_3CHO$
$(III)$ $(CH_3)_2CO$
$(IV)$ $(Me_3C)_2CO$

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What will be the order of reactivity of the following carbonyl compounds with a nucleophile?$(I)$ $HCHO$$(II)$ $CH_3CHO$$(III)$ $(CH_3)_2CO$$(IV)$ $(Me_3C)_2CO$