JEE Main · 2022 · 26 Jul 2022 · Shift 2 · Hydrocarbons

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

(A)(see structure)
(B)(see structure)
✓ Correct
(C)(see structure)
(D)(see structure)

Answer: (B)

Solution

Benzenoid compounds contain one or more benzene rings with delocalized π-electrons following Hückel's rule (4n+2 π-electrons). Option (B) shows a cyclooctatetraene structure, which is a non-benzenoid compound. It has 8 π-electrons (4n, where n=2), making it antiaromatic and non-planar, unlike benzene and its derivatives shown in the other options.

JEE Main · 2022 · 26 Jul 2022 · Shift 2 · Single correct option

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