Which of the followig is aromatic like benzene?

Options

A. Cyclopentadiene
B. Cyclopentadienenyl anion
C. Cyclopentadienyl cation
D. Cyclopentadienyl free radical

Answer

2

Explanation

Cyclopentadienyl anion is aromatic because it satisfies huckel's rule of aromaticity. It is a closed shell `6pi` `e^(-)` species its electrons distribution is Cyclopentadiene and cyclopentadienyl cation with `4pie^(-)`'s are diradicals. Cyclopentadienyl free radical has `5pie^(-)'s`.