In the following compounds, what is the increasing order of their reactivity towards nucleophilic addition reactions?
Benzaldehyde, p-Tolualdehyde, p-Nitrobenzaldehyde, Acetophenone
1
Benzaldehyde < p-Tolualdehyde < p-Nitrobenzaldehyde < Acetophenone
2
Acetophenone < Benzaldehyde < p-Tolualdehyde < p-Nitrobenzaldehyde
3
Acetophenone < p-Tolualdehyde < Benzaldehyde < p-Nitrobenzaldehyde
4
Benzaldehyde < Acetophenone < p-Tolualdehyde $<$ p-Nitrobenzaldehyde