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: Convert Acetylene to Benzene
1. **Starting Material**: Begin with acetylene (C₂H₂), which has the structure CH≡CH.
2. **Reaction**: Treat acetylene with a red hot iron (Fe) tube. This process involves heating the acetylene, which leads to the formation of benzene (C₆H₆) as a major product.
3. **Mechanism**: When three moles of acetylene (3 C₂H₂) are heated, they undergo a cyclization reaction, where the carbon atoms interact and rearrange to form the six-membered aromatic ring of benzene.

### Step 2: Nitration of Benzene
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