How many resonance structures (including the one drawn) can be written for the ion shown, counting only structures with complete octets on all atoms except the cationic carbon?

Answer: B

The ion shown is the cyclohexadienyl (arenium) cation, a pentadienyl cation held in a ring by one sp3 CH2 carbon. The positive charge is located on the three carbons that are ortho and para to the sp3 carbon. This gives 3 structures.

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