Which one of the following pairs is correctly matched ?

Options

A. Sucrose: reducing sugar
B. Glucose: mutarotation
C. Fructose : monosaccharide
D. Sucrose : monosaccharide

Answer

To solve the question of which one of the following pairs is correctly matched, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the pairs**: We need to look at each pair mentioned in the options and determine if they are correctly matched or not.

2. **Evaluate Sucrose**:
- Sucrose is a disaccharide composed of alpha-D-glucose and beta-D-fructose.
- It is important to note that sucrose is a non-reducing sugar because it does not have a free aldehyde or ketone group.
- Therefore, if one of the pairs states that sucrose is a reducing sugar, that statement is incorrect.

3. **Evaluate Glucose**:
- Glucose is known to show mutarotation, which is the change in optical rotation due to the interconversion between its alpha and beta anomers in solution.
- This statement is correct, as glucose does exhibit mutarotation.

4. **Evaluate Fructose**:
- Fructose is a monosaccharide, which means it is a simple sugar that cannot be hydrolyzed into simpler sugars.
- If a pair states that fructose is a monosaccharide, that statement is also correct.

5. **Conclusion**:
- Based on the evaluations, the pairs that are correctly matched are those that state glucose shows mutarotation and fructose is a monosaccharide.
- Therefore, the correctly matched pairs are options two and three.

### Final Answer:
The correctly matched pairs are options two and three.

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