A cyclic compound 'X' has molecular formula `C_(6)H_(6)`. It is an unsaturated compound and burns with sooty flame. Identify 'X' and write its structural formula.

Explanation

To solve the problem, we need to identify the cyclic compound 'X' with the molecular formula \( C_6H_6 \), which is unsaturated and burns with a sooty flame.

### Step-by-Step Solution:

1. **Identify the Molecular Formula**: The given molecular formula is \( C_6H_6 \). This indicates that the compound contains 6 carbon atoms and 6 hydrogen atoms.

2. **Determine Unsaturation**: The term "unsaturated" refers to the presence of double or triple bonds in the compound. For hydrocarbons, the degree of unsaturation can be calculated using the formula:
\[
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