Conversion of Phenylhydrazine from aniline

Explanation

To convert aniline to phenylhydrazine, we will follow a two-step reaction process involving diazotization and reduction. Here’s a step-by-step breakdown of the conversion:

### Step 1: Diazotization of Aniline
1. **Starting Material**: Begin with aniline (C6H5NH2).
2. **Reagents**: React aniline with sodium nitrite (NaNO2) and hydrochloric acid (HCl) at a temperature between 0 to 5 degrees Celsius.
3. **Reaction**: The amino group (-NH2) of aniline is converted into a diazonium salt (C6H5N2Cl). The reaction can be summarized as:
\[
C6H5NH2 + NaNO2 + HCl \rightarrow C6H5N2^+Cl^- + 2H2O
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