which of the following disaccharides will give two molecules of glucose on hydrolysis ?

Options

A. Maltose
B. Sucrose
C. Lactose
D. None

Answer

To determine which disaccharide will yield two molecules of glucose upon hydrolysis, we need to analyze the hydrolysis products of the given disaccharides.

### Step-by-Step Solution:

1. **Understand Disaccharides**: Disaccharides are carbohydrates composed of two monosaccharide units linked by a glycosidic bond.

2. **Analyze Maltose**:
- Maltose is composed of two glucose molecules linked together.
- Upon hydrolysis (the addition of water), maltose breaks down into two glucose molecules.
- Therefore, maltose will give two molecules of glucose when hydrolyzed.

3. **Analyze Sucrose**:
- Sucrose is made up of one glucose molecule and one fructose molecule.
- Hydrolysis of sucrose results in one molecule of glucose and one molecule of fructose.
- Thus, sucrose does not yield two glucose molecules upon hydrolysis.

4. **Analyze Lactose**:
- Lactose consists of one glucose molecule and one galactose molecule.
- Hydrolysis of lactose results in one molecule of glucose and one molecule of galactose.
- Therefore, lactose also does not yield two glucose molecules upon hydrolysis.

5. **Consider the Option "None"**:
- The option "none" implies that none of the disaccharides yield two glucose molecules, which is incorrect since maltose does.

### Conclusion:
The only disaccharide that gives two molecules of glucose on hydrolysis is **maltose**.

### Final Answer:
**Maltose** is the correct answer.

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