Consider following reagent:
I. `Br_(2)` water II. Tollen's reagent III. Fehling's solution
which can be used to make distinction between an aldose and a ketose?

Options

A. I,II and III
B. II and III
C. I only
D. II only

Answer

To distinguish between an aldose and a ketose using the given reagents, we can analyze each reagent's reaction with these types of sugars.

### Step-by-Step Solution:

1. **Understanding Aldoses and Ketoses**:
- Aldoses are monosaccharides that contain an aldehyde group (-CHO).
- Ketoses are monosaccharides that contain a ketone group (C=O).

2. **Analyzing Bromine Water**:
- Bromine water is a mild oxidizing agent.
- When an aldose (like glucose) is treated with bromine water, it gets oxidized to form gluconic acid. This reaction indicates the presence of the aldehyde group.
- In contrast, ketoses (like fructose) do not react with bromine water because they lack an aldehyde group. Therefore, no oxidation occurs.

3. **Analyzing Tollen's Reagent**:
- Tollen's reagent is used to test for reducing sugars. Both aldoses and ketoses can act as reducing sugars, so this reagent cannot distinguish between them.

4. **Analyzing Fehling's Solution**:
- Similar to Tollen's reagent, Fehling's solution is also used to test for reducing sugars. Again, both aldoses and ketoses can give a positive result, making it ineffective for distinguishing between the two.

5. **Conclusion**:
- The only reagent that can effectively distinguish between an aldose and a ketose is bromine water. Therefore, the answer is:
- **Bromine Water (I)** can be used to make a distinction between an aldose and a ketose.

### Final Answer:
**Bromine Water (I)** is the reagent that can be used to distinguish between an aldose and a ketose.

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