How will you prepare para dinitrobenzene from benzene?

Explanation

To prepare para-dinitrobenzene from benzene, we will follow a series of chemical reactions. Here’s a step-by-step breakdown of the process:

### Step 1: Nitration of Benzene
- **Reaction**: Benzene reacts with a mixture of concentrated nitric acid (HNO3) and concentrated sulfuric acid (H2SO4).
- **Mechanism**: The concentrated sulfuric acid acts as a catalyst and helps generate the nitronium ion (NO2+), which is the electrophile that will attack the benzene ring.
- **Product**: This reaction will yield nitrobenzene (C6H5NO2).

### Step 2: Reduction of Nitrobenzene to Aniline
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