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JEE Main levelSingle correct optionDifficulty 2 of 3g1134

Which one of the following is aromatic?

Acyclobutadiene
Bcyclopentadienyl cation (cyclopenta-2,4-dien-1-ylium)
Ccyclopropenyl anion (cycloprop-2-en-1-ide)
Dcyclopentadienyl anion (cyclopenta-2,4-dien-1-ide)

Answer: D

The cyclopentadienyl anion is planar and cyclic with 6 pi electrons (

4 n + 2

,

n = 1

). The cyclopentadienyl cation, cyclopropenyl anion and cyclobutadiene each have 4 pi electrons and are antiaromatic.

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