Which of the following species is aromatic according to Huckel's rule?

ACyclopentadienyl cation
BCyclopentadienyl anion
CCycloheptatrienyl anion
DCyclooctatetraene

Answer: B

Aromatic species are planar, cyclic, fully conjugated and have

(4 n + 2)

pi electrons. The cyclopentadienyl anion has 6 pi electrons. The cation has 4 and the cycloheptatrienyl anion has 8, and cyclooctatetraene is non-planar with 8.

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