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Which of the following is not aromatic?...

Which of the following is not aromatic?

A

Benzene

B

Cyclopropenly cation

C

Tropylium cation

D

Cyclopentadieny cation

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The correct Answer is:
4
Cyclopentadienyl cation is not aromatic compound cyclic compound with `(4n) pi e^(-)` are anti aromatic compound cyclopentadienyl cation has `4pi e^(-)` hence it is an anti aromatic compound.
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  10. . The product C is :

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