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Multiple Choice

How many delocalised electron are there for each benzene molecule?

Benzene has a fully conjugated ring where all six p orbitals overlap, creating a continuous delocalized π electron cloud around the ring. Each carbon contributes one electron to this π system, giving six π electrons in total. This delocalization is what gives benzene its characteristic stability and equal bond lengths, and it fits the aromaticity requirement (4n+2) with n = 1, which also points to six electrons. So the delocalised electron count is six. The other numbers don’t describe benzene’s continually overlapping π system.

Benzene has a fully conjugated ring where all six p orbitals overlap, creating a continuous delocalized π electron cloud around the ring. Each carbon contributes one electron to this π system, giving six π electrons in total. This delocalization is what gives benzene its characteristic stability and equal bond lengths, and it fits the aromaticity requirement (4n+2) with n = 1, which also points to six electrons. So the delocalised electron count is six. The other numbers don’t describe benzene’s continually overlapping π system.