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This is a tough question. Virtually every Organic chemistry teacher will say 2....the two Kekule resonance structures. However....that is incorrect. Benzene also has 4 other minor resonance forms. Mathematical calculations, as well as quantum mechanics have shown conclusively that benzene is not 2 sole resonance canonicals....but the Dewar structures as well. My proof is this....the bond order is not 1.5, as predicted....but rather 1.463. Hope this helps. Dr Jim Romano CEO Romano Scientific CEO Orgoman.com

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