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NEET levelSingle correct optionDifficulty 1 of 3g1117

Which of the following is aromatic?

Acyclobutadiene
Bcyclopropenyl anion (cycloprop-2-en-1-ide)
Ccyclopentadienyl cation (cyclopenta-2,4-dien-1-ylium)
Dbenzene

Answer: D

Benzene is planar, cyclic, fully conjugated with 6 pi electrons,

4 n + 2

with

n = 1

. The other three have 4 pi electrons each and are antiaromatic.

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