Azoxybenzene can be obtained by the treatment of mitro-benzene with :

Options

A. `O_2`
B. `H_2//Pt`
C. `NaAsO_3//NaOH`
D. `Zn//NaOH`

Answer

To solve the question of how azoxybenzene can be obtained from nitrobenzene, we will follow these steps:

### Step-by-Step Solution:

1. **Understanding Nitrobenzene**: Nitrobenzene (C6H5NO2) is an aromatic compound that contains a nitro group (-NO2) attached to a benzene ring.

2. **Reduction of Nitrobenzene**: The first step in the transformation of nitrobenzene to azoxybenzene involves the reduction of the nitro group. Nitrobenzene can be reduced to nitrosobenzene (C6H5NO) using reducing agents.

3. **Formation of Nitrosobenzene**: The nitro group (-NO2) in nitrobenzene is reduced to a nitroso group (-NO) to form nitrosobenzene. This reduction can be achieved using sodium sulfite (Na2SO3) in the presence of a base like sodium hydroxide (NaOH).

4. **Further Reaction**: The nitrosobenzene can then react with another molecule of nitrosobenzene or aniline (resulting from the further reduction of nitrosobenzene) to form azoxybenzene (C12H10N2O). This reaction involves the coupling of two nitroso groups, leading to the formation of the azoxy compound with the elimination of water.

5. **Final Product**: The final product, azoxybenzene, is formed through the elimination of water from the coupling reaction of nitrosobenzene or aniline.

### Conclusion:
The correct answer to the question is that azoxybenzene can be obtained by the treatment of nitrobenzene with **Na2SO3 and NaOH**.