Question

Which of the following is not an example of benzenoid compound?

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is A, B

To determine which compound is not a benzenoid compound, we need to understand what benzenoid compounds are. Benzenoid compounds are organic compounds that contain one or more benzene rings in their chemical structure. Compounds that do not have this structure are classified as non-benzenoid.

Let's examine the provided options: 

Cyclopentadienyl cation: This compound has a five-membered ring with conjugated double bonds, but it lacks a benzene ring structure.

Tropylium cation: This compound consists of a seven-membered ring with a conjugated system. It is not a benzenoid compound as it does not contain a benzene ring.

Benzene: This is a classic example of a benzenoid compound as it consists of a single benzene ring.

Naphthalene: This compound contains two fused benzene rings, making it a benzenoid compound.

Based on the analysis above, the compounds that do not have benzene rings in their structure and are thus not benzenoid are:

• Cyclopentadienyl cation
• Tropylium cation

Therefore, the correct answer is:

These compounds, Cyclopentadienyl cation and Tropylium cation, are not benzenoid compounds.