The mojor product `(70%` to `80%`) of the reaction between m-dinitrobenzene with `NH_4HS` is

Options

A.
B.
C.
D.

Answer

To find the major product of the reaction between m-dinitrobenzene and ammonium hydrosulfite (NH4HS), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants are m-dinitrobenzene and ammonium hydrosulfite (NH4HS).
- m-Dinitrobenzene has two nitro groups (-NO2) attached to the benzene ring in the meta positions.

2. **Draw the Structure of m-Dinitrobenzene**:
- The structure can be represented as follows:
```
NO2
|
C6H4
|
NO2
```

3. **Understand the Reaction**:
- Ammonium hydrosulfite (NH4HS) is a reducing agent.
- In this reaction, one of the nitro groups will undergo selective reduction to form an amine group (-NH2).

4. **Determine the Selectivity of Reduction**:
- The meta position of the nitro groups makes it more likely for one of the nitro groups to be reduced to an amine while the other remains unchanged.
- Typically, the nitro group in the more reactive position (which is still meta) will be reduced.

5. **Draw the Major Product**:
- After the reduction, the product will have one -NH2 group and one -NO2 group remaining. The structure of the major product, which is m-nitroaniline, can be represented as:
```
NH2
|
C6H4
|
NO2
```

6. **Conclusion**:
- The major product of the reaction between m-dinitrobenzene and NH4HS is m-nitroaniline, which is formed in a yield of 70% to 80%.

### Final Answer:
The major product of the reaction is **m-nitroaniline**.

---