Suggest a route for the preparation of nitrobenzene starting from acetylene ?

Explanation

To prepare nitrobenzene starting from acetylene, we can follow these steps:

### Step 1: Formation of Benzene from Acetylene
1. **Starting Material**: Acetylene (C₂H₂) is our starting compound.
2. **Reaction**: We need to convert acetylene into benzene. This can be achieved by heating three moles of acetylene in a red-hot iron tube.
\[ 3 \, \text{C}_2\text{H}_2 \xrightarrow{\text{red-hot Fe tube}} \text{C}_6\text{H}_6 \]
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