An aldohexose (e.g., glucose) and 2 - oxohexose (e.g., fructose) can be distinguished with the help of

Options

A. Tollen's reagent
B. Fehling's solution
C. Benedict solution
D. `Br_(2)+H_(2)O`

Answer

To distinguish between an aldohexose (like glucose) and a 2-oxohexose (like fructose), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Compounds**:
- Aldohexose: Glucose (an aldohexose contains an aldehyde group).
- 2-Oxohexose: Fructose (a ketose contains a ketone group).

2. **Understand the Reaction**:
- We will use Bromine water (Br2 in H2O) as a reagent to differentiate between glucose and fructose.

3. **Perform the Reaction with Glucose**:
- When glucose is treated with Br2 in the presence of water, it undergoes oxidation to form gluconic acid. This reaction results in the decolorization of the bromine solution, indicating that a reaction has occurred.

4. **Perform the Reaction with Fructose**:
- When fructose is treated with Br2 in the presence of water, no reaction occurs. The solution remains unchanged, and the fructose does not oxidize.

5. **Conclusion**:
- The difference in reactivity towards Br2 in H2O allows us to distinguish between glucose and fructose. Glucose reacts and decolorizes the bromine solution, while fructose does not react and the solution remains colored.

### Final Answer:
The aldohexose (glucose) and the 2-oxohexose (fructose) can be distinguished with the help of Br2 in H2O.

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