Which one of the following does not exhibit the phenomenon of mutarotation ?

Options

A. (+)sucrose
B. (+) lactose
C. (+) Maltose
D. (-) Fructose

Explanation

To determine which compound does not exhibit the phenomenon of mutarotation, we need to understand what mutarotation is and the structural characteristics of the compounds in question.

### Step-by-Step Solution:

1. **Define Mutarotation**:
- Mutarotation is the change in optical rotation that occurs when an anomeric carbon in a sugar molecule converts between its alpha and beta forms. This process is typically observed in sugars that have a free aldehyde or ketone group.

2. **Identify the Compounds**:
- We need to analyze the four compounds given in the question. The compounds typically considered in such questions are sucrose, lactose, maltose, and fructose.

3. **Analyze Sucrose**:
- Sucrose is a disaccharide composed of glucose and fructose. However, it does not have a free anomeric carbon because it is a non-reducing sugar. Therefore, it does not exhibit mutarotation.

4. **Analyze Lactose**:
- Lactose is a disaccharide made up of glucose and galactose. It has a free anomeric carbon, which allows it to undergo mutarotation.

5. **Analyze Maltose**:
- Maltose is also a disaccharide composed of two glucose units. It has a free anomeric carbon and can undergo mutarotation.

6. **Analyze Fructose**:
- Fructose is a monosaccharide with a ketone group. It also has a free anomeric carbon and can undergo mutarotation.

7. **Conclusion**:
- Since sucrose does not have a free anomeric carbon and is a non-reducing sugar, it does not exhibit mutarotation. Therefore, the answer is **sucrose**.

### Final Answer:
**Sucrose does not exhibit the phenomenon of mutarotation.**