Question

Which of the following compounds cannot be classified as aromatic?

• A. 1, 2, 3- Tripheneylcyclopropenium cation
• B. Cycloctatatetraenyl dianion
• C. Azulene
• D. 10-Annulene

Answer 1

The correct option is D 10-Annulene

1, 2, 3- Tripheneylcyclopropenium cation, Cycloctatatetraenyl dianion and Azulene can be classified as aromatic however, 10-Annulene cannot be classified as aromatic.

Aromatic compounds are cyclic, planar compounds with $4n+2\pi$ electrons that are delocalized over a ring.

Hence the correct option is D.