A solution of d-glucose in water rotates the plane polarised light

Options

A. towards right
B. towards left
C. towards either side
D. none of the above

Answer

To solve the question regarding the optical activity of a D-glucose solution in water, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Optical Activity**:
- Optical activity refers to the ability of a substance to rotate the plane of polarized light. This property is exhibited by certain compounds, including sugars like glucose.

2. **Identifying D-Glucose**:
- D-glucose is a specific form of glucose that is known to be optically active. It is one of the most common monosaccharides found in nature.

3. **Direction of Rotation**:
- When polarized light passes through an optically active substance, it can rotate the light either to the right (clockwise) or to the left (counterclockwise).
- Substances that rotate light to the right are termed "dextrorotatory" (denoted as +), while those that rotate it to the left are termed "levorotatory" (denoted as -).

4. **D-Glucose's Optical Activity**:
- D-glucose is classified as a dextrorotatory compound. Therefore, when a solution of D-glucose in water is exposed to plane polarized light, it will rotate the light towards the right.

5. **Conclusion**:
- Based on the properties of D-glucose, we conclude that the solution will rotate the plane polarized light towards the right.

### Final Answer:
The solution of D-glucose in water rotates the plane polarized light towards the right.

---