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Multiple Choice

How many delocalised electrons are there for each benzene molecule?

Delocalized pi electrons arise from a planar cyclic conjugated system where each carbon in benzene contributes one electron to a p orbital, and these p orbitals overlap around the ring to form a continuous pi network. With six carbons, there are six pi electrons shared around the ring, not confined to individual double bonds. This six-electron delocalized system is what gives benzene its aromatic stability and the characteristic equal bond lengths. The count of six also fits Hückel’s rule for aromaticity (4n+2, with n = 1). So, benzene has six delocalised electrons.

Delocalized pi electrons arise from a planar cyclic conjugated system where each carbon in benzene contributes one electron to a p orbital, and these p orbitals overlap around the ring to form a continuous pi network. With six carbons, there are six pi electrons shared around the ring, not confined to individual double bonds. This six-electron delocalized system is what gives benzene its aromatic stability and the characteristic equal bond lengths. The count of six also fits Hückel’s rule for aromaticity (4n+2, with n = 1). So, benzene has six delocalised electrons.