Among the given organic compounds, the total number of aromatic compounds is
Correct Answer: 3
Approach Solution - 1
To determine the number of aromatic compounds, we must check each structure for aromaticity criteria: cyclic, planar, fully conjugated, and follows Huckel’s rule (4n+2 π electrons).
- (A) Biphenyl: Consists of two benzene rings. Each benzene ring is aromatic, fulfilling all criteria.
- (B) Not aromatic: Contains an sp3 hybridized carbon disrupting planarity and conjugation.
- (C) Indole: Contains a benzene ring and a five-membered heterocycle. The entire structure is planar and follows Huckel's rule.
- (D) Benzofuran: Contains fused benzene and furan rings. The structure is cyclic, planar, fully conjugated, and adheres to Huckel's rule.
Count of aromatic compounds: (A), (C), (D) = 3.
Approach Solution -2
Compounds B, C, and D are aromatic. Aromatic compounds must follow Huckel’s rule (\(4n + 2\) electrons) and have a planar, conjugated structure. Compound A is not aromatic as it does not satisfy these criteria.
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