Which compound amongst the following is not an aromatic compound ? 1. [structure in figure] 2. [structure in figure] 3. [structure in figure] 4. [structure in figure]

Answer: 1. [structure in figure] Key idea: an aromatic compound is cyclic, planar, fully conjugated and has (4n+2) π electrons. (1) Cycloheptatriene has an sp³ CH₂ in the ring, so conjugation is broken. Not aromatic. (2) Cyclopentadienyl anion: 6 π electrons. Aromatic. (3) Tropylium cation: 6 π electrons. Aromatic. (4) Cyclopropenyl cation: 2 π electrons. Aromatic.

Topic: Benzene: structure and aromaticity· Hydrocarbons

Which compound amongst the following is not an aromatic compound ?

four ring structures: cycloheptatriene-like ring (1), cyclopentadienyl anion (2), tropylium cation (3), cyclopropenyl cation (4)

1. [structure in figure]

2. [structure in figure]

3. [structure in figure]

4. [structure in figure]

Doubtly Asked 30 Oct 2026 NEET UG 2022 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 1. [structure in figure]

Key idea: an aromatic compound is cyclic, planar, fully conjugated and has \((4n+2)\) \(\pi\) electrons.

(1) Cycloheptatriene has an \(sp^3\) \(\mathrm{CH_2}\) in the ring, so conjugation is broken. Not aromatic.
(2) Cyclopentadienyl anion: 6 \(\pi\) electrons. Aromatic.
(3) Tropylium cation: 6 \(\pi\) electrons. Aromatic.
(4) Cyclopropenyl cation: 2 \(\pi\) electrons. Aromatic.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?

Which compound amongst the following is not an aromatic compound ?

1 answer

Your answer