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 6πe−, i.e. (4n+2)πe− thus following huckel's rule. Both cyclopentadienyl anion and benzene are aromatic