Glucose and fructose can be distinguished by

Options

A. Barford's tests
B. Fehling solution
C. Bendict
D. Saliwanoff's test

Answer

To distinguish between glucose and fructose, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Compounds**:
- Glucose is an aldose (a sugar with an aldehyde group).
- Fructose is a ketose (a sugar with a ketone group).

2. **Identifying the Tests**:
- We have four tests to consider: Barfoed's test, Fehling's solution, Benedict's test, and Selivanoff's test.

3. **Analyzing Barfoed's Test**:
- Barfoed's test is used to detect monosaccharides. Both glucose and fructose will give a positive result in this test, as they are both monosaccharides. Therefore, this test cannot distinguish between them.

4. **Analyzing Fehling's Solution**:
- Fehling's solution is used for reducing sugars. Both glucose and fructose will also give a positive result in this test because fructose can be converted to glucose in an alkaline medium. Thus, this test is also not suitable for distinguishing between glucose and fructose.

5. **Analyzing Benedict's Test**:
- Benedict's test is similar to Fehling's solution and is also used for reducing sugars. Since both glucose and fructose are reducing sugars, this test will not differentiate between them either.

6. **Analyzing Selivanoff's Test**:
- Selivanoff's test specifically distinguishes between aldoses and ketoses. In this test, glucose (aldose) reacts differently compared to fructose (ketose). Therefore, this test can effectively distinguish between glucose and fructose.

7. **Conclusion**:
- The most suitable test to distinguish between glucose and fructose is the Selivanoff's test.

### Final Answer:
Glucose and fructose can be distinguished by **Selivanoff's test**.

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