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JEE Main · 2021 · 01 Sep 2021 · Shift 2 · General Organic Chemistry

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Which one of the following compounds is aromatic in nature?
  1. (A)(see structure)
  2. (B)(see structure)
  3. (C)(see structure)
    ✓ Correct
  4. (D)(see structure)

Answer: (C)

Solution

A compound is aromatic if it satisfies Hückel's rule: it must be cyclic, planar, fully conjugated, and have (4n+2) π electrons. Option (C) shows a fused ring system (appears to be azulene or similar) that is a 10π electron system (4×2+2=10), making it aromatic. The other options either lack the required π electron count or are not fully conjugated planar systems. Thus, the correct answer is (C).

JEE Main · 2021 · 01 Sep 2021 · Shift 2 · Single correct option

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