Aldehydes and ketons are specially susceptible to nucleophilic addition because carbonyl group

is polar (due to electronegativity difference between carbon and oxygen). Positive charge on carbon makes it reactive towards the nucleophile. This addition is catalysed by acid.Reactivity of carbonyl compound towards nucleopilic addition increases with increase in the electron deficiency at carbonyl carbon. Thus, (– I.E.) groups increase while (+ I.E.) groups decrease the reactivity of carbonyl compound.

(i) Which among the following is most reactive to give nucleophilic addition ?