How will you prepare para dinitrobenzene from benzene?

Explanation

To prepare para-dinitrobenzene from benzene, we can follow a series of chemical reactions involving nitration and reduction. Here is a step-by-step breakdown of the process:

### Step 1: Nitration of Benzene
- **Reaction:** Benzene (C6H6) is treated with a mixture of concentrated nitric acid (HNO3) and concentrated sulfuric acid (H2SO4).
- **Result:** This reaction introduces a nitro group (NO2) to the benzene ring, resulting in the formation of nitrobenzene (C6H5NO2).

### Step 2: Reduction of Nitrobenzene to Aniline
- **Reaction:** Nitrobenzene is then reduced to aniline (C6H5NH2) using tin (Sn) and hydrochloric acid (HCl).
...