Among the following, the aromatic compounds are:
General Organic Chemistry (GOC) · Class 11 · JEE Main Previous Year Question
Among the following, the aromatic compounds are:
- a
(B), (C) and (D) only
- b
(A) and (B) only
- c
(A), (B) and (C) only
- d✓
(B) and (C) only
(B) and (C) only
Step 1: Check Each Compound
(A) Non conjugated cyclic structure: Not aromatic.
(B) Benzene: Aromatic.
(C) Cyclopentadienyl anion (): 6 pi electrons (4n+2, n=1), cyclic, planar. Aromatic.
(D) Cyclopentadienyl cation (): 4 pi electrons (4n, n=1). Antiaromatic. Not aromatic.
Aromatic: B and C = option (d).
Key Points:
- Styrene: benzene ring is aromatic but the molecule overall is not fully aromatic
- Cyclopentadienyl anion: 6 pi e, aromatic (very stable)
- Cyclopentadienyl cation: 4 pi e, antiaromatic (very unstable)
- Pyridine: 6 pi e aromatic (N uses p orbital for pi system, lone pair in plane)
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