All of the following are the example of benzenoid aromatic compounds, except

Options

A. Tolune
B. Azulene
C. Naphthalene
D. Anhracene

Answer

To solve the question regarding which of the following compounds is not a benzenoid aromatic compound, we will analyze each option step by step.

### Step 1: Understand Benzenoid Aromatic Compounds
Benzenoid aromatic compounds are defined as aromatic compounds that contain at least one benzene ring in their structure. Aromatic compounds must be cyclic, planar, and follow Huckel's rule (4n + 2 π electrons).

### Step 2: Analyze Each Option
1. **Toluene (C7H8)**:
- Structure: Toluene consists of a benzene ring with a methyl group (–CH3) attached.
- Conclusion: Toluene has a benzene ring, so it is a benzenoid aromatic compound.

2. **Azulene (C10H8)**:
- Structure: Azulene is a bicyclic compound that does not contain a benzene ring. It has a unique structure with a fused five-membered and seven-membered ring.
- Conclusion: Azulene does not have a benzene ring, so it is not a benzenoid aromatic compound.

3. **Naphthalene (C10H8)**:
- Structure: Naphthalene consists of two fused benzene rings.
- Conclusion: Naphthalene has benzene rings, so it is a benzenoid aromatic compound.

4. **Anthracene (C14H10)**:
- Structure: Anthracene consists of three fused benzene rings.
- Conclusion: Anthracene has benzene rings, so it is a benzenoid aromatic compound.

### Step 3: Final Conclusion
Based on the analysis:
- Toluene, Naphthalene, and Anthracene are all benzenoid aromatic compounds because they contain benzene rings.
- Azulene is not a benzenoid aromatic compound because it does not contain any benzene rings.

Thus, the answer to the question is **Azulene**.

### Summary of the Answer
All of the following are examples of benzenoid aromatic compounds except **Azulene**.

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