Which of the following reducing agent will not reduce the nitrobenzene to azobenzene

Options

A. `Zn//NaOH`
B. `LiAlH_(4)`
C. Sodium amalgam
D. `SnCl_(2)//HCl`.

Explanation

To determine which reducing agent will not reduce nitrobenzene to azobenzene, we need to analyze the reactions of nitrobenzene with various reducing agents.

### Step-by-Step Solution:

1. **Identify Nitrobenzene**:
Nitrobenzene is a compound with the formula C6H5NO2, where a nitro group (NO2) is attached to a benzene ring.

2. **Understand the Reduction Process**:
The reduction of nitrobenzene can lead to different products depending on the reducing agent used. The primary products of interest are azobenzene (C6H5-N=N-C6H5) and aniline (C6H5-NH2).

3. **List Common Reducing Agents**:
- Lithium aluminum hydride (LiAlH4)
- Sodium amalgam (Na/Hg)
- Zinc in the presence of NaOH
- Zinc in the presence of HCl
- Stannous chloride (SnCl2) in the presence of HCl

4. **Analyze Each Reducing Agent**:
- **Lithium Aluminum Hydride (LiAlH4)**: Reduces nitrobenzene to azobenzene.
- **Sodium Amalgam (Na/Hg)**: Reduces nitrobenzene to azobenzene.
- **Zinc in the presence of NaOH**: Reduces nitrobenzene to azobenzene.
- **Zinc in the presence of HCl**: Reduces nitrobenzene to aniline, not azobenzene.
- **Stannous Chloride (SnCl2) in the presence of HCl**: Reduces nitrobenzene to aniline, not azobenzene.

5. **Conclusion**:
The reducing agents that do not convert nitrobenzene to azobenzene are:
- Zinc in the presence of HCl
- Stannous Chloride (SnCl2) in the presence of HCl

Thus, the correct answer to the question is that both zinc in the presence of HCl and SnCl2 in the presence of HCl do not reduce nitrobenzene to azobenzene. However, if we are to select one option as per the question, we can choose **Zinc in the presence of HCl**.

### Final Answer:
**Zinc in presence of HCl will not reduce nitrobenzene to azobenzene.**