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

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$Butanone < Propanone < Benzaldehyde < Propanal$

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(A) The reactivity of carbonyl compounds towards nucleophilic addition reactions depends on two factors: steric hindrance and electronic effects.$1$. Steric hindrance: Smaller groups around the carbonyl carbon increase reactivity. Aldehydes are more reactive than ketones.$2$. Electronic effects: Electron-donating groups decrease the electrophilicity of the carbonyl carbon,thus decreasing reactivity.Comparing the compounds:- $Propanal$ $(CH_3CH_2CHO)$: Most reactive (Aldehyde,least steric hindrance).- $Benzaldehyde$ $(C_6H_5CHO)$: Less reactive than $Propanal$ due to resonance stabilization of the carbonyl group by the phenyl ring.- $Propanone$ $(CH_3COCH_3)$: Ketone,less reactive than aldehydes due to steric hindrance and $+I$ effect of two methyl groups.- $Butanone$ $(CH_3COCH_2CH_3)$: Least reactive due to greater steric hindrance compared to $Propanone$.Thus,the increasing order of reactivity is: $Butanone < Propanone < Benzaldehyde < Propanal$.

The increasing order of the reactivity of the following compounds in nucleophilic addition reaction is:
Propanal,Benzaldehyde,Propanone,Butanone

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The increasing order of the reactivity of the following compounds in nucleophilic addition reaction is:Propanal,Benzaldehyde,Propanone,Butanone