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JEE Advanced levelSingle correct optionDifficulty 3 of 3g1154

Among benzene, pyridine, cyclopentadienyl anion, furan, cyclobutadiene and cyclopenta-1,3-diene, the number of aromatic species is

A6
B3
C4
D5

Answer: C

Benzene (6 pi e), pyridine (6 pi e), the cyclopentadienyl anion (6 pi e) and furan (6 pi e) are planar, cyclic, fully conjugated and obey

4 n + 2

. Cyclobutadiene is antiaromatic and cyclopenta-1,3-diene has an sp3 carbon. So 4 are aromatic.

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