Among the following, the aromatic compounds are :
Choose the correct answer from the following options :
Choose the correct answer from the following options :
Show Hint
- (B), (C) and (D) only
- (B) and (C) only
- (A), (B) and (C) only
- (A) and (B) only
The Correct Option is B
Solution and Explanation
(A): the ring contains a \(\mathrm{CH_2}\) (sp3) carbon, so the ring is not completely conjugated; not aromatic.
(B): benzene is cyclic, planar, fully conjugated with 6 pi electrons: aromatic.
(C): the cyclopentadienyl anion has 4 pi electrons from the two C=C plus the 2 electrons of the carbanion lone pair in a p orbital, i.e. 6 pi electrons: aromatic.
(D): the cyclopentadienyl cation has only 4 pi electrons (\(4n\) with \(n=1\)): anti-aromatic.
Therefore the aromatic compounds are (B) and (C) only.
Answer: (2) (B) and (C) only
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