Which one of the following is a reducing sugar?

Options

A. A) Maltose
B. B) Cellulose
C. C) Glucose
D. D) Sucrose

Answer

To determine which of the given options is a reducing sugar, we can follow these steps:

### Step 1: Understand what a reducing sugar is
A reducing sugar is a carbohydrate that can donate electrons to another chemical, thus reducing it. This typically occurs because the sugar has a free aldehyde or ketone group that can be oxidized.

### Step 2: Analyze the options
We have four options to consider:
- **Option A: Maltose**
- **Option B: Cellulose**
- **Option C: Glucose**
- **Option D: Sucrose**

### Step 3: Evaluate each option
1. **Maltose**: Maltose is a disaccharide composed of two glucose units. It has a free aldehyde group in one of the glucose units, which can be oxidized, making it a reducing sugar.

2. **Cellulose**: Cellulose is a polysaccharide made up of many glucose units linked together. It does not have a free aldehyde group, so it is not a reducing sugar.

3. **Glucose**: Glucose is a monosaccharide with a free aldehyde group. It can easily donate electrons, making it a reducing sugar.

4. **Sucrose**: Sucrose is a disaccharide formed from glucose and fructose. In sucrose, the aldehyde group of glucose is involved in the glycosidic bond, meaning it is not free to act as a reducing agent. Therefore, sucrose is not a reducing sugar.

### Step 4: Conclusion
Based on the analysis, the only reducing sugar among the options is **Option C: Glucose**.

### Final Answer
The answer is **Glucose (Option C)**.

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