Which does not mutarotation

Options

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

Explanation

To determine which sugar does not show mutarotation, we need to understand what mutarotation is and the properties of the sugars listed in the options.

### Step-by-Step Solution:

1. **Define Mutarotation**:
- Mutarotation is the change in the optical rotation of a sugar solution as it equilibrates between its anomeric forms. This typically occurs in sugars that can exist in cyclic forms and have a free anomeric carbon.

2. **Identify the Sugars**:
- The options given are sucrose, maltose, glucose, and fructose.

3. **Analyze Each Sugar**:
- **Glucose**: Glucose is a reducing sugar and can undergo mutarotation because it has a free anomeric carbon (the carbon that is part of the hemiacetal).
- **Fructose**: Fructose is also a reducing sugar and can undergo mutarotation as it has a free anomeric carbon.
- **Maltose**: Maltose is a disaccharide made of two glucose units and has a free anomeric carbon, allowing it to undergo mutarotation.
- **Sucrose**: Sucrose is a disaccharide composed of glucose and fructose. However, it is a non-reducing sugar because the anomeric carbons of both glucose and fructose are involved in the glycosidic bond, leaving no free anomeric carbon available.

4. **Conclusion**:
- Since sucrose does not have a free anomeric carbon and cannot undergo mutarotation, the answer is **sucrose**.

### Final Answer:
**Sucrose does not show mutarotation.**