Which one of the following is invert sugar ?

Options

A. Lactose
B. Maltose
C. Sucrose
D. All of these

Answer

To determine which of the following is an invert sugar, we need to understand what invert sugar is and how it is formed.

### Step-by-Step Solution:

1. **Definition of Invert Sugar**: Invert sugar is a mixture of two monosaccharides, glucose and fructose, obtained by the hydrolysis of sucrose. It is called "invert" because the hydrolysis changes the optical rotation of the sugar solution from positive to negative.

2. **Identify the Sugars**: The options provided are:
- Lactose
- Maltose
- Sucrose
- All of these

3. **Understanding Sucrose**: Sucrose is a disaccharide composed of glucose and fructose. When sucrose undergoes hydrolysis (usually in the presence of an acid or enzyme), it splits into its constituent monosaccharides: glucose and fructose.

4. **Optical Activity**: Sucrose is a dextrorotatory sugar, meaning it rotates plane-polarized light to the right (positive). However, when it is hydrolyzed into glucose and fructose, the resulting solution rotates plane-polarized light to the left (negative).

5. **Conclusion**: Since the hydrolysis of sucrose results in a mixture of glucose and fructose, and this process is what defines invert sugar, we can conclude that sucrose is the invert sugar.

6. **Final Answer**: Therefore, the correct answer to the question "Which one of the following is invert sugar?" is **Sucrose**.