Question

Which of the following compounds is aromatic?

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

(a) has $6\pi e^{-}$ i.e. $(4n+2)\pi e^{-}$ , is planar and has conjugation, so it is an aromatic compound.
(b) has $4\pi e^{-}$ i.e. $\left(4n\right)\pi e^{-}$ , is planar and has conjugation. It is anti-aromatic.
(c) has $4\pi e^{-}$ i.e. $\left(4n\right)\pi e^{-}$ , is planar and has conjugation. It is anti-aromatic.
(c) has $4\pi e^{-}$ i.e. $\left(4n\right)\pi e^{-}$ , is planar and has conjugation. It is anti-aromatic.