Tropolone is

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(C) Tropolone is a seven-membered ring compound containing a carbonyl group and a hydroxyl group. It does not contain a benzene ring,so it is non-benz

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non-benzenoid and aromatic

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(C) Tropolone is a seven-membered ring compound containing a carbonyl group and a hydroxyl group. It does not contain a benzene ring,so it is non-benzenoid. It exhibits aromatic character due to the resonance structure where the seven-membered ring becomes a tropylium cation $(C_7H_7^+)$,which follows $H$ückel's rule ($4n+2$ $\pi$ electrons,where $n=1$). Thus,tropolone is non-benzenoid and aromatic.

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