Fructose reduces Fehling's solution due to the presence of:

Options

A. hydroxy group
B. aldehyde group
C. ketone group
D. `alpha`-hydroxy ketone group

Explanation

To solve the question "Fructose reduces Fehling's solution due to the presence of:", we need to analyze the structure of fructose and its functional groups.

### Step-by-Step Solution:

1. **Identify the Structure of Fructose**:
- Fructose is a simple sugar (monosaccharide) with the molecular formula C6H12O6. Its structure includes a ketone group and multiple hydroxyl (OH) groups.

2. **Recognize the Functional Groups**:
- Fructose contains a ketone group (C=O) located at the second carbon of its carbon chain. Additionally, it has several hydroxyl groups attached to other carbons.

3. **Understand the Reaction with Fehling's Solution**:
- Fehling's solution is used to test for reducing sugars. It typically reacts with aldehydes, which can reduce the copper(II) ions in the solution to copper(I) oxide.

4. **Tautomerism in Fructose**:
- Although fructose has a ketone group, it can undergo tautomerism to form an aldehyde. Tautomerism is a chemical reaction that involves the shift of a hydrogen atom and a switch of a double bond. In the case of fructose, the ketone can convert to an aldehyde through this process.

5. **Formation of the Aldehyde**:
- During tautomerism, the hydroxyl group at the alpha position (the carbon adjacent to the ketone) allows the ketone to convert into an aldehyde. This newly formed aldehyde is capable of reducing Fehling's solution.

6. **Conclusion**:
- Therefore, the ability of fructose to reduce Fehling's solution is due to the presence of the alpha hydroxy ketone group, which facilitates the tautomerization to an aldehyde.

### Final Answer:
Fructose reduces Fehling's solution due to the presence of an **alpha hydroxy ketone group**.