Which of the following does not show any reducing test of aldehyde

Options

A. Sucrose
B. Fructose
C. Maltose
D. Lactose

Explanation

To determine which of the following does not show any reducing test of aldehyde, we need to analyze the options provided. In this case, we will focus on sucrose as the primary candidate.

### Step-by-Step Solution:

1. **Understanding Reducing Sugars**:
- Reducing sugars are carbohydrates that can donate electrons to another chemical species, which is a characteristic of aldehydes and some ketones. They typically contain a free aldehyde or ketone group.

2. **Identifying Sucrose**:
- Sucrose is a disaccharide composed of two monosaccharides: glucose and fructose. These monosaccharides are linked by an alpha-1,2-glycosidic bond.

3. **Analyzing the Structure of Sucrose**:
- In sucrose, the glycosidic bond between glucose and fructose involves the anomeric carbon of both monosaccharides. This means that neither of the monosaccharides has a free aldehyde or ketone group available for reduction.

4. **Conclusion on Sucrose**:
- Since sucrose does not have a free aldehyde or ketone group, it does not act as a reducing sugar. Therefore, it will not show any reducing test for aldehydes.

5. **Final Answer**:
- The correct answer is sucrose, as it does not show any reducing test of aldehyde.