On hydrolysis which of the following carbohydrates give only glucose?

Options

A. sucrose
B. Lactose
C. Maltose
D. starch

Answer

To determine which carbohydrates yield only glucose upon hydrolysis, we will analyze the hydrolysis products of each carbohydrate mentioned in the question.

### Step-by-Step Solution:

1. **Identify the Carbohydrates**: The carbohydrates in question are sucrose, lactose, maltose, and starch.

2. **Hydrolysis of Sucrose**:
- Sucrose is a disaccharide composed of glucose and fructose.
- Upon hydrolysis, sucrose breaks down into one molecule of glucose and one molecule of fructose.
- **Conclusion**: Sucrose does not yield only glucose.

3. **Hydrolysis of Lactose**:
- Lactose is also a disaccharide made up of glucose and galactose.
- When hydrolyzed, lactose yields one molecule of glucose and one molecule of galactose.
- **Conclusion**: Lactose does not yield only glucose.

4. **Hydrolysis of Maltose**:
- Maltose is a disaccharide consisting of two glucose units.
- Upon hydrolysis, maltose breaks down to yield two molecules of glucose.
- **Conclusion**: Maltose yields only glucose.

5. **Hydrolysis of Starch**:
- Starch is a polysaccharide made up of numerous glucose units linked together.
- When hydrolyzed, starch yields many glucose molecules (N number of glucose units).
- **Conclusion**: Starch yields only glucose.

6. **Final Answer**:
- The carbohydrates that yield only glucose upon hydrolysis are **maltose** and **starch**.

### Summary:
- Sucrose → Glucose + Fructose (not only glucose)
- Lactose → Glucose + Galactose (not only glucose)
- Maltose → Glucose + Glucose (only glucose)
- Starch → Multiple Glucose units (only glucose)

Thus, the correct options are **C (Maltose)** and **D (Starch)**.