Which sugar is called invert sugar? Why is it called so?

Explanation

**Step-by-Step Solution:**

1. **Identify Invert Sugar**: The sugar that is referred to as invert sugar is sucrose.

2. **Understand the Hydrolysis Process**: Invert sugar is formed when sucrose undergoes hydrolysis. During hydrolysis, sucrose is broken down into two monosaccharides: glucose and fructose.

3. **Examine Optical Activity**: Sucrose is known to be dextro rotatory, meaning it rotates plane-polarized light in a clockwise direction.

...