A : D-fructose is levorotatory
R : D-Glucose is dextrorotatory

Options

A. If both Assertion and Reason are true and the reason is the correct explanation of the assertion, then mark (1).
B. If both Assertion and Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
C. If Assertion is true statement but Reason is false, then mark (3).
D. If both Assertion and Reason are false statements, then mark (4).

Answer

To solve the assertion and reason question regarding D-fructose and D-glucose, we will analyze both statements step by step.

### Step 1: Analyze the Assertion
The assertion states: "D-fructose is levorotatory."

- **Understanding D-fructose**: D-fructose is a simple sugar (monosaccharide) that has a specific configuration. The "D" designation indicates the orientation of the hydroxyl group (-OH) on the last chiral carbon in the molecule.
- **Levorotatory**: A compound is levorotatory if it rotates plane-polarized light to the left (counterclockwise).

**Conclusion for Assertion**: D-fructose is indeed levorotatory, meaning this part of the assertion is true.

### Step 2: Analyze the Reason
The reason states: "D-glucose is dextrorotatory."

- **Understanding D-glucose**: D-glucose is another simple sugar, and like D-fructose, it has a specific configuration. The "D" indicates the position of the hydroxyl group on the last chiral carbon.
- **Dextrorotatory**: A compound is dextrorotatory if it rotates plane-polarized light to the right (clockwise).

**Conclusion for Reason**: D-glucose is indeed dextrorotatory, meaning this part of the reason is also true.

### Step 3: Determine the Relationship
Now that we have established that both the assertion and the reason are true, we need to check if the reason correctly explains the assertion.

- **Relationship Analysis**: The assertion about D-fructose being levorotatory does not depend on D-glucose being dextrorotatory. They are two separate facts about different sugars. Therefore, while both statements are true, the reason does not serve as a correct explanation for the assertion.

### Final Conclusion
- **Assertion (A)**: True
- **Reason (R)**: True
- **Explanation Relationship**: The reason does not explain the assertion.

### Final Answer
Both the assertion and reason are true, but the reason is not the correct explanation for the assertion.

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