Aldehyde with `NH_2 .NH_2` forms

Options

A. Hydrazones
B. Aniline
C. Nitrobenzene
D. None of these

Explanation

To determine the product formed when an aldehyde reacts with hydrazine (NH₂NH₂), we can follow these steps:

### Step 1: Understand the Reactants
- An aldehyde has the general structure R-CHO, where R is a hydrocarbon group.
- Hydrazine is represented as NH₂NH₂.

### Step 2: Reaction Mechanism
- When an aldehyde reacts with hydrazine, it undergoes a condensation reaction. This means that the aldehyde and hydrazine will combine, and a water molecule (H₂O) will be eliminated in the process.

### Step 3: Formation of Hydrazone
- The reaction can be represented as follows:
\[ R-CHO + NH_2NH_2 \rightarrow R-CH=N-NH_2 + H_2O \]
- Here, the carbonyl group (C=O) of the aldehyde reacts with one of the amine groups (NH₂) from hydrazine, forming a hydrazone (R-CH=N-NH₂) and releasing water.

### Step 4: Final Product
- The final product of this reaction is known as a hydrazone. The structure of the hydrazone can be represented as:
\[ R-CH=N-NH_2 \]
- This compound is characterized by the presence of a double bond between carbon and nitrogen (C=N).

### Conclusion
- Therefore, the product formed when an aldehyde reacts with hydrazine is a hydrazone.

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