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Question

Among the following which is correct?

A
Cyclopentadienyl anion is antiaromatic whereas benzene is aromatic.
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B
Benzene is aromatic whereas cyclopentadienyl is nonaromatic.
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C
Both cyclopentadienyl anion and benzene are aromatic.
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D
None of these
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Solution

The correct option is C Both cyclopentadienyl anion and benzene are aromatic.

Both are planar .
In cyclopentadienyl anion, the negative charge is in delocalisation with the ring double bonds.
Both have 6 π e, i.e. (4n+2) π e thus following huckel's rule.
Both cyclopentadienyl anion and benzene are aromatic

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