Question

The number of benzenoid and non-benzenoid aromatic species present in the following list are respectively Naphthalene, Toluene, Cycloheptatrienyl cation, Anthracene

• A. 3, 1
• B. 2, 2
• C. 4, 0
• D. 0, 4

Hint:

Aromaticity can be classified into benzenoid and non-benzenoid compounds. Benzenoid compounds contain fused benzene rings, whereas non-benzenoid compounds might contain other ring structures but still adhere to the rules of aromaticity.

Answer 1

The Correct Option is A

Step 1: Let's analyze each compound for its aromaticity.
- Naphthalene: It is a benzenoid aromatic species, as it has a benzene ring structure.
- Toluene: It is also a benzenoid aromatic species because of the benzene ring.
- Cycloheptatrienyl cation: This is a non-benzenoid aromatic species because it does not have a benzene ring structure, but it still maintains aromaticity due to the Huckel rule.
- Anthracene: This is a benzenoid aromatic species, as it consists of fused benzene rings.
Thus, the number of benzenoid species is 3 (Naphthalene, Toluene, and Anthracene), and the number of non-benzenoid species is 1 (Cycloheptatrienyl cation).
Thus, the correct answer is 3, 1.