Question

Among the following, the aromatic compounds are:


Choose the correct answer from the following options:

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• A. (A), (B) and (C) only
• B. (A) and (B) only
• C. (B) and (C) only
• D. (B), (C) and (D) only

Answer 1

The correct option is C (B) and (C) only

Conditions for aromaticity are

(i) Planarity

(ii) Complete delocalisation of the $\pi$ electrons in the ring.

(iii) Presence of $(4n+2)\pi$ electrons in the ring where n is an integer (n = 0, 1, 2...).
Compounds B and C are aromatic since all the conditions for aromaticity are satisfied
Compound A is non-aromatic since it has $s{p}^3$ hybridised carbon. Hence non-planar
Compound D is anti-aromatic. It has $4n\pi e^{-}$