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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.
Acetophenone < p – tolualdehyde < benzaldehyde < p – nitrobenzaldehyde
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