Question

Among the given organic compounds, the total number of aromatic compounds is

Answer 1

Correct Answer: 3

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. 

Answer 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.