Assertion:- Fructose does not contain an aldehyde group but still reduce tollen's reagent.
Reason:- In presence of dilute solution of alkali, fructose undergoes epimerisation to form glucose and mannose.

Options

A. If both Assertion `&` Reason are True `&` the Reason is a correct explanation of the Assertion.
B. If both Assertion `&` Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion `&` Reason are False.

Answer

To solve the assertion-reason question, we will analyze both the assertion and the reason step by step.

### Step 1: Analyze the Assertion
**Assertion:** Fructose does not contain an aldehyde group but still reduces Tollens' reagent.

- **Explanation:**
- Fructose is a ketone (specifically a ketose) and does not have an aldehyde group. However, it can still reduce Tollens' reagent because it is classified as an alpha-hydroxy ketone.
- The presence of the hydroxyl group (-OH) on the carbon adjacent to the carbonyl group (C=O) allows fructose to undergo tautomerization to form an aldehyde in situ, which is capable of reducing Tollens' reagent.

### Step 2: Analyze the Reason
**Reason:** In the presence of a dilute solution of alkali, fructose undergoes epimerization to form glucose and mannose.

- **Explanation:**
- Epimerization is a type of isomerization that involves the conversion of one epimer to another by changing the configuration at one specific carbon atom.
- In the case of fructose, when treated with a dilute alkali, it can rearrange to form glucose and mannose, which are epimers of each other at the second carbon atom.

### Step 3: Conclusion
- Both the assertion and the reason are true.
- The reason correctly explains the assertion because the ability of fructose to reduce Tollens' reagent can be attributed to its conversion to glucose and mannose in the presence of alkali.

### Final Answer
Both the assertion and reason are true, and the reason is the correct explanation of the assertion.

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