Which statements are correct about sucrose?

Options

A. IUPAC name of sucrose is `alpha`-D-glucopyranosyl-`beta`-D-fructofuranside.
B. IUPAC name of sucrose is `beta`-D-fructofuranosyl-`alpha`-D-glucopyranoside.
C. It is hydrolysed both by emulsin and amylase.
D. On hydrolysis, the solution is laevorotatory.

Answer

To determine which statements are correct about sucrose, we will analyze each statement based on the structure and properties of sucrose.

### Step-by-Step Solution:

1. **Understanding the Structure of Sucrose**:
- Sucrose is a disaccharide composed of glucose and fructose.
- Glucose forms a six-membered ring (pyranose structure), while fructose forms a five-membered ring (furanose structure).
- The linkage between glucose and fructose in sucrose is an α-1,2-glycosidic bond.

2. **Identifying the Correct IUPAC Name**:
- The correct IUPAC name for sucrose is α-D-glucopyranosyl-β-D-fructofuranoside.
- This name reflects the structures of both monosaccharides and the type of glycosidic bond formed.

3. **Evaluating Statement 1**:
- Statement A: "The IUPAC name is α-D-glucopyranosyl-β-D-fructofuranoside."
- This statement is correct as it accurately describes the structure and naming of sucrose.

4. **Evaluating Statement 2**:
- Statement B: "The IUPAC name is β-D-glucopyranosyl-α-D-fructofuranoside."
- This statement is incorrect because the order of the components and the suffixes are wrong. The correct order is α-D-glucopyranosyl followed by β-D-fructofuranoside.

5. **Evaluating Statement 3**:
- Statement C: "Sucrose is hydrolyzed by amylase."
- This statement is correct. Sucrose can be hydrolyzed by enzymes such as amylase, which breaks it down into glucose and fructose.

6. **Evaluating Statement 4**:
- Statement D: "On hydrolysis, sucrose produces a mixture of glucose and fructose, which has a net levorotatory specific rotation."
- This statement is also correct. The hydrolysis of sucrose results in a mixture of glucose and fructose, which exhibits a negative specific rotation (levorotatory) due to the inversion of rotation that occurs during hydrolysis.

### Conclusion:
Based on the evaluations:
- **Correct Statements**: A, C, and D.
- **Incorrect Statement**: B.

Thus, the final answer is that statements A, C, and D are correct about sucrose.