Question

Would you expect benzaldehyde to be more reactive or less reactive in nucleophlic addition reaction than propanal? Explain.

Answer 1

In Benzaldehyde the charge is delocalized over beneze ring, since there is no electron donating group attached to benzene ring and -CHO group is electron withdrawing group due to which there is deficiency of charge on benzene ring and whatever they have it is distributed over the ring.

So it will less reactive towards Nucelophilic reaction.