Q.

Cyclopentadienyl anion is

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a

non-benzenoid and non-aromatic

b

non-benzenoid and aromatic

c

benzenoid and aromatic

d

non-benzenoid and anti-aromatic

answer is B.

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Detailed Solution

  • Benzene or benzene-like structures are characteristics of benzenoid compounds. When examining the cyclopentadienyl anion's structure, it is clear that it does not resemble benzene because it only has five carbon atoms as opposed to benzene's six. So, we can refer to it as a non-benzenoid structure because it is not a benzenoid, also since cyclopentadienyl anion obeys Huckel's rule it’s an aromatic compound. 
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