Which statements`(s) is//are` correct about sucrose?

Options

A. `(C_(1)-alpha)(OH)` of glucopyranose is linked with `(C_(2(-beta)(OH)` of fructofuranose.
B. `(C_(1)-alpha)(OH)` of glucopyranose is linked with `(C_(2)-beta)(OH)` of fructopyranose.
C. It reduces Fehling's solution.
D. It exhibits mutarotation.

Answer

To determine which statements about sucrose are correct, we need to analyze the structure and properties of sucrose. Here’s a step-by-step breakdown:

### Step 1: Understand the Structure of Sucrose
- Sucrose is a disaccharide composed of two monosaccharides: glucose and fructose.
- The structure of sucrose can be represented as follows:
- Glucose (in its pyranose form) is linked to fructose (in its furanose form) through a glycosidic bond.

**Hint:** Draw the structure of sucrose to visualize the linkage between glucose and fructose.

### Step 2: Identify the Glycosidic Linkage
- The glycosidic bond in sucrose is formed between the anomeric carbon (C1) of glucose and the C2 of fructose.
- This linkage is an α(1→2) glycosidic bond.

**Hint:** Remember that the anomeric carbon is the carbon that was part of the carbonyl group in the open-chain form of the sugar.

### Step 3: Determine if Sucrose is a Reducing Sugar
- A reducing sugar has a free aldehyde or ketone group that can reduce other compounds.
- In sucrose, the glycosidic bond prevents the anomeric carbon of glucose from being free, making sucrose a non-reducing sugar.

**Hint:** Check if the anomeric carbon has a hydroxyl group; if not, it cannot act as a reducing sugar.

### Step 4: Analyze Mutarotation
- Mutarotation is the change in optical rotation due to the change in the equilibrium between the α and β anomers of a sugar.
- Since sucrose does not have a free anomeric carbon (due to the glycosidic bond), it cannot undergo mutarotation.

**Hint:** Recall that mutarotation requires the ability to interconvert between anomers, which is not possible in sucrose.

### Step 5: Evaluate the Statements
1. **Statement 1:** Correct - The linkage between C1 of glucose and C2 of fructose is indeed correct.
2. **Statement 2:** Incorrect - Glucose is linked to fructose, but fructose is in the furanose form, not the pyranose form.
3. **Statement 3:** Correct - Sucrose does not reduce Fehling's solution due to being a non-reducing sugar.
4. **Statement 4:** Correct - Sucrose cannot undergo mutarotation because it lacks a free anomeric carbon.

### Final Conclusion
- The correct statements about sucrose are:
- Statement 1 is correct.
- Statement 3 is correct.
- Statement 4 is correct.
- Statement 2 is incorrect.

**Final Answer:** Statements 1, 3, and 4 are correct about sucrose.