In the following compounds, what is the increasing order of their reactivity towards nucleophilic addition reactions?
Benzaldehyde, p-Tolualdehyde, p-Nitrobenzaldehyde, Acetophenone

Correct option is C

Order of reactivity: acetophenone < p-tolualdehyde < benzaldehyde < p-nitrobenzaldehyde. Due to hyperconjugation, methyl group in p-tolualdehyde is electron releasing because of which the positive charge on carbonyl carbon decreases.