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 need to understand what benzenoid aromatic compounds are and analyze the given options.

### Step 1: Define Benzenoid Aromatic Compounds
Benzenoid aromatic compounds are those that contain a benzene ring or multiple fused benzene rings in their structure. These compounds exhibit aromaticity due to the delocalization of π-electrons in a cyclic, planar structure with alternating single and double bonds.

### Step 2: Analyze Each Compound
1. **Toluene**: This compound consists of a benzene ring with a methyl group (–CH₃) attached. Since it contains a benzene ring, it is a benzenoid aromatic compound.

2. **Azulene**: Azulene has a structure that consists of a 7-membered ring fused with a 5-membered ring. Although it is aromatic, it does not contain a benzene ring, making it a non-benzenoid aromatic compound.

3. **Naphthalene**: This compound is made up of two fused benzene rings. Since it contains benzene rings, it is classified as a benzenoid aromatic compound.

4. **Anthracene**: Anthracene consists of three fused benzene rings. Like naphthalene, it contains benzene rings and is therefore a benzenoid aromatic compound.

### Step 3: Identify the Exception
From the analysis above, we see that:
- Toluene, naphthalene, and anthracene are all benzenoid aromatic compounds.
- Azulene is the only compound that does not contain a benzene ring.

### Conclusion
The compound that is not a benzenoid aromatic compound is **Azulene**.

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