The alkaline `CuSO_(4)` containing sodium potassium tartrate does not react with

Options

A. `CH_(3)CHO`
B. `C_(2)H_(5)CHO`
C. `C_(6)H_(5)CH_(2)CHO`
D. `C_(6)H_(5)CHO`

Answer

To solve the question, "The alkaline `CuSO4` containing sodium potassium tartrate does not react with," we need to understand the context of the reaction and the substances involved.

### Step-by-Step Solution:

1. **Understanding the Reaction**: The alkaline `CuSO4` solution containing sodium potassium tartrate is known as Fehling's solution. This solution is used to test for the presence of aldehydes.

2. **Identifying the Reactivity**: Fehling's solution reacts with aldehydes to produce a red precipitate of copper(I) oxide (Cu2O). However, not all aldehydes react with it.

3. **Aromatic Aldehydes**: Aromatic aldehydes, such as benzaldehyde (C6H5CHO), do not react with Fehling's solution. This is because the carbonyl group (C=O) in aromatic aldehydes is stabilized by resonance with the benzene ring, making it less susceptible to oxidation.

4. **Conclusion**: Since the question asks which compound does not react with alkaline `CuSO4` containing sodium potassium tartrate, the answer is an aromatic aldehyde. Specifically, benzaldehyde (C6H5CHO) does not react with this solution.

### Final Answer:
The alkaline `CuSO4` containing sodium potassium tartrate does not react with **benzaldehyde (C6H5CHO)**.