Question

Which of the following compounds is/are aromatic in nature?

• A.
• B.
• C.
• D.

Answer 1

Answer: (A), (B), (D)

Any hydrocarbon can be classified as an aromatic compound provided they follow the Huckel rule. According to Huckel rule, for a ring to be aromatic it should have the following properties:
(1) Planarity
(2) Complete delocalization of the $\pi$ electrons in the ring.
(3) Presence of $(4n+2)\pi$ electrons in the ring where n is an integer (n = 0, 1, 2, . . .)
Anti-aromatic compounds contain $4n\pi$ elctrons.