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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3g1162

Which of the following are aromatic?

Acyclopropenyl cation
Bcyclopentadienyl anion
Cthiophene
Dcyclopentadienyl cation

Answer: A, B, C

Cyclopropenyl cation has 2 pi e, cyclopentadienyl anion 6 pi e, and thiophene 6 pi e (sulfur contributes one lone pair), all planar, cyclic, conjugated. The cyclopentadienyl cation has 4 pi e and is antiaromatic.

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