Question:
Tropone is an example of
Tropone is an example of
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Common Non-benzenoid Aromatic examples to remember: Tropylium cation, Azulene, and Tropone. They all lack the typical hexagonal benzene unit but satisfy Hückel's rule for stability.
Updated On: Jun 24, 2026
- alicyclic compound
- acyclic compound
- heterocyclic compound
- benzenoid aromatic compound
- Tropone is a non-benzenoid aromatic compound.
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Solution and Explanation
Step 1: Understanding the Concept:
Aromatic compounds are characterized by cyclic, planar structures with a conjugated system of \((4n + 2) \pi\) electrons (Hückel's Rule). They are divided into benzenoid (containing a benzene ring) and non-benzenoid categories.
Step 2: Detailed Explanation:
1. Tropone (cyclohepta-2,4,6-trien-1-one) is a seven-membered ring with three double bonds and a carbonyl group.
2. It exhibits aromatic character because the dipolar resonance structure (\(O^-\) attached to a tropylium cation ring) contains 6 \(\pi\) electrons in the ring (\(n=1\) for Hückel's rule).
3. Since it is aromatic but does not contain a six-membered benzene ring, it is classified as a non-benzenoid aromatic compound.
Step 3: Final Answer:
Tropone is a non-benzenoid aromatic compound.
Aromatic compounds are characterized by cyclic, planar structures with a conjugated system of \((4n + 2) \pi\) electrons (Hückel's Rule). They are divided into benzenoid (containing a benzene ring) and non-benzenoid categories.
Step 2: Detailed Explanation:
1. Tropone (cyclohepta-2,4,6-trien-1-one) is a seven-membered ring with three double bonds and a carbonyl group.
2. It exhibits aromatic character because the dipolar resonance structure (\(O^-\) attached to a tropylium cation ring) contains 6 \(\pi\) electrons in the ring (\(n=1\) for Hückel's rule).
3. Since it is aromatic but does not contain a six-membered benzene ring, it is classified as a non-benzenoid aromatic compound.
Step 3: Final Answer:
Tropone is a non-benzenoid aromatic compound.
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