Board Type Questions

Prob 1.     Arrange the following compounds in increasing order of their reactivity in nucleophilic addition reaction:

Benzaldehyde, p – tolualdehyde, p – nitrobenzaldehyde, acetophenone.

Sol.           Acetophenone is ketone, all other are aldehydes, it is less reactive. +M group increases electron density and so makes the compound unfit for nucleophilic addition & vice versa is true for ¾M group.

Order is:

Acetophenone < p – tolualdehyde < benzaldehyde < p – nitrobenzaldehyde

Questions Part-II

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