Assertion : Sugar charcoal is prepared by dehydration of sugar.
Reason : Sulphuric acid is a dehydrating agent.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Explanation

To analyze the assertion and reason provided in the question, we will break it down step by step.

### Step 1: Understanding the Assertion
The assertion states that "Sugar charcoal is prepared by dehydration of sugar."
- **Explanation**: Sugar charcoal, also known as carbonized sugar or sugar charcoal, is indeed produced when sugar undergoes dehydration. This process involves the removal of water (H2O) from sugar molecules, resulting in the formation of carbon-rich residue.

### Step 2: Understanding the Reason
The reason states that "Sulphuric acid is a dehydrating agent."
- **Explanation**: Sulphuric acid (H2SO4) is a well-known dehydrating agent. It has a strong affinity for water and can remove water molecules from other substances. In the case of sugar, when concentrated sulphuric acid is added, it removes water from sugar, leading to the formation of sugar charcoal.

### Step 3: Evaluating the Relationship
Now, we need to evaluate whether the reason correctly explains the assertion.
- **Analysis**: The assertion is true, as sugar charcoal is indeed prepared by dehydration of sugar. The reason is also true, as sulphuric acid is a dehydrating agent. However, the reason does not specifically explain how sugar charcoal is formed; it simply states a fact about sulphuric acid.

### Conclusion
- **Final Answer**: Both the assertion and the reason are true, but the reason does not adequately explain the assertion. Therefore, the correct response would be that the assertion is true, the reason is true, but the reason is not the correct explanation for the assertion.