Reduction of Nitrobenzene in Alkaline Medium
Nitrobenzene is a compound that contains a nitro group (-NO2) attached to a benzene ring. Reduction of nitrobenzene is a common reaction that can occur in different conditions, including in an alkaline medium. In this reduction reaction, the nitro group is converted into an amino group (-NH2), resulting in the formation of different products.

Formation of Products
When nitrobenzene is reduced in an alkaline medium, several products can be formed. These include:

1. Aniline (Option A)
Aniline is the primary product formed during the reduction of nitrobenzene in an alkaline medium. The nitro group (-NO2) is reduced to an amino group (-NH2), resulting in the formation of aniline. This reaction occurs through the intermediate formation of nitrosobenzene.

2. Azoxybenzene (Option B)
Azoxybenzene is another product that can be formed during the reduction of nitrobenzene in an alkaline medium. It is formed through the reaction between two molecules of nitrosobenzene, which is an intermediate in the reduction process. Azoxybenzene contains an -N=N- linkage and is commonly used as a dye intermediate.

3. Hydrazobenzene (Option C)
Hydrazobenzene is a product that can be formed when nitrobenzene is reduced in an alkaline medium. It is formed through the reaction between one molecule of nitrosobenzene and one molecule of aniline. Hydrazobenzene contains a hydrazine (-NH-NH-) linkage.

4. Azobenzene (Option D)
Azobenzene is another product that can be formed during the reduction of nitrobenzene in an alkaline medium. It is formed through the reaction between two molecules of aniline. Azobenzene contains an -N=N- linkage and is commonly used as a dye.

Explanation of the Correct Answer
The correct answer is option A, Aniline. Aniline is actually formed during the reduction of nitrobenzene in an alkaline medium, so it is a product of the reaction. Therefore, option A is incorrect.