Which of the following is not aromatic?

benzene

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cyclo octatetraenyl diamion

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tropyliumion

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cyclopenta dineyl cation

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Solution

The correct option is D cyclopenta dineyl cation
A,B,C are aromatic with (4n+2) $π$ e-
cyclopenta dineyl cation does not follow Huckle's rule. Thus it is not aromatic compound.

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