JEE Main Chemistry question

Which of the following species is aromatic? [AMU 2009]

(A)Cyclopentadienyl cation (4e)
(B)Cyclopentadienyl anion (6e)Correct
(C)Cyclopentadiene, neutral (not fully conjugated)
(D)Cyclohexadienyl cation (an arenium-type ion, 4e in the relevant cyclic array)

Answer: (B)

Solution

Only the cyclopentadienyl anion is planar, cyclic, fully conjugated and has 6 -electrons (, ), satisfying

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Question ID VK-142301