Invert sugar is laevorotatory. True/False

Explanation

**Step-by-Step Solution:**

1. **Understanding Invert Sugar**: Invert sugar is defined as an equimolar mixture of two monosaccharides: D-glucose and D-fructose.

2. **Properties of Sucrose**: Sucrose is a disaccharide that is dextrorotatory, meaning it rotates plane-polarized light in a clockwise direction. Its specific rotation is +66.7°.

3. **Hydrolysis of Sucrose**: When sucrose undergoes hydrolysis, it breaks down into D-glucose and D-fructose.

4. **Specific Rotation of Monosaccharides**:
- D-glucose has a specific rotation of +52.7° (dextrorotatory).
- D-fructose has a specific rotation of -92.5° (levorotatory).

5. **Calculating the Overall Specific Rotation**: Since invert sugar is an equimolar mixture of D-glucose and D-fructose, we need to consider the specific rotations of both:
- The contribution from D-glucose is +52.7°.
- The contribution from D-fructose is -92.5°.

6. **Resulting Specific Rotation**: The overall specific rotation of the mixture can be calculated as follows:
\[ \text{Overall Specific Rotation} = \frac{1}{2}(+52.7°) + \frac{1}{2}(-92.5°) = \frac{52.7 - 92.5}{2} = \frac{-39.8}{2} = -19.9° \]
Since the overall specific rotation is negative, the mixture is levorotatory.

7. **Conclusion**: Since invert sugar is levorotatory, the statement "Invert sugar is levorotatory" is **True**.

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