JEE Main Chemistry question

Which of the following compounds is not aromatic? [J & K CET 2004]

(A)Cyclopropenyl cation (2 e, aromatic)
(B)Cyclopentadienyl anion (6 e, aromatic)
(C)Cyclopentadienyl cation (4 e, antiaromatic)Correct
(D)Pyridine (6 e, aromatic)

Answer: (C)

Solution

By Hückel's rule, a planar, fully conjugated, cyclic system is aromatic if it has -electrons. Cyclopropenyl cation (n=0, 2e), cyclopentadienyl anion (n=1, 6e) and pyridine

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Question ID VK-142260