How can the following conversions be brought about :
Nitrobenzene to p-aminoazobenzene.

Explanation

To convert nitrobenzene to para-aminoazobenzene, we can follow these steps:

### Step 1: Reduction of Nitrobenzene to Aniline
- **Reaction**: Nitrobenzene (C6H5NO2) is reduced to aniline (C6H5NH2).
- **Reagents**: This can be achieved using hydrogen gas (H2) in the presence of a catalyst like tin (Sn) and hydrochloric acid (HCl).
- **Equation**:
\[
\text{C6H5NO2} + 6 \text{H} \xrightarrow{\text{Sn, HCl}} \text{C6H5NH2} + 2 \text{H2O}
...