Fehling's solution can make distinction between:

Explanation

To solve the question regarding the distinction made by Fehling's solution, we will analyze the properties of the compounds involved and the nature of Fehling's solution.

### Step-by-Step Solution:

1. **Understanding Fehling's Solution**:
- Fehling's solution is a chemical reagent used to differentiate between aldehydes and ketones. It contains copper(II) ions, which can be reduced to copper(I) oxide (Cu2O) in the presence of aldehydes, resulting in a red precipitate.

2. **Identifying the Compounds**:
- The first pair of compounds is:
- Methyl aldehyde (Acetaldehyde, CH3CHO)
- Benzaldehyde (C6H5CHO)
- The second pair of compounds is:
- Methyl aldehyde (Acetaldehyde, CH3CHO)
- Formaldehyde (HCHO)

3. **Analyzing the First Pair**:
- Methyl aldehyde (Acetaldehyde) is an aliphatic aldehyde and can reduce Fehling's solution, giving a positive test (red precipitate).
- Benzaldehyde, on the other hand, is an aromatic aldehyde and does not reduce Fehling's solution, resulting in a negative test (no red precipitate).
- Therefore, Fehling's solution can distinguish between methyl aldehyde and benzaldehyde.

4. **Analyzing the Second Pair**:
- Both methyl aldehyde (Acetaldehyde) and formaldehyde are aliphatic aldehydes.
- Since both can reduce Fehling's solution, they will both give a positive test (red precipitate).
- Thus, Fehling's solution cannot distinguish between methyl aldehyde and formaldehyde.

5. **Conclusion**:
- Fehling's solution can distinguish between the first pair (methyl aldehyde and benzaldehyde) but cannot distinguish between the second pair (methyl aldehyde and formaldehyde).
- Therefore, the correct answer to the question is that Fehling's solution can make a distinction between methyl aldehyde and benzaldehyde.

### Final Answer:
Fehling's solution can distinguish between methyl aldehyde (CH3CHO) and benzaldehyde (C6H5CHO).