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Correct statement with respect to sucros...

Correct statement with respect to sucrose is

A

It is dextrotatory and gives dextrorotatory glucose and laevorotatory fructose on hydrolysis

B

It is laevorotatory amd gives laevorotatory glucose and dextrorotatory fructose on hydrolysis

C

It is dextrorotatory amd gives levorotatory glucose amd dextrorotatory fructose on hydrolysis

D

It is laevorotatory and gives dextrorotatory glucose and laevorotatory fructose on hydrolysis

Text Solution

AI Generated Solution

The correct Answer is:
To determine the correct statement with respect to sucrose, we need to analyze each of the provided options based on the properties of sucrose and its hydrolysis products. ### Step-by-Step Solution: 1. **Identify the Chemical Structure of Sucrose**: - Sucrose is a disaccharide composed of glucose and fructose. Its chemical formula is C12H22O11. 2. **Understand the Hydrolysis of Sucrose**: - When sucrose undergoes hydrolysis in the presence of a dilute acid, it breaks down into one molecule of D-glucose and one molecule of D-fructose: \[ \text{C}_{12}\text{H}_{22}\text{O}_{11} + \text{H}_2\text{O} \rightarrow \text{C}_6\text{H}_{12}\text{O}_6 (\text{glucose}) + \text{C}_6\text{H}_{12}\text{O}_6 (\text{fructose}) \] 3. **Determine the Optical Activity**: - Sucrose is known to be dextrorotatory, which means it rotates plane-polarized light to the right (clockwise). The specific rotation of sucrose is +66.5°. - D-glucose is also dextrorotatory with a specific rotation of +52.5°. - D-fructose, on the other hand, is levorotatory, meaning it rotates plane-polarized light to the left (counterclockwise), with a specific rotation of -92.4°. 4. **Analyze the Resulting Mixture**: - Upon hydrolysis, the resulting mixture of D-glucose and D-fructose will have a net rotation that is determined by the specific rotations of both sugars. - Since the specific rotation of fructose is more negative (higher absolute value) than that of glucose, the resulting mixture becomes levorotatory after hydrolysis. 5. **Evaluate Each Statement**: - **Option 1**: "Sucrose is dextrorotatory and gives dextrorotatory glucose and levorotatory fructose on hydrolysis." - This statement is correct. - **Option 2**: "Sucrose is levorotatory and gives levorotatory glucose and dextrorotatory fructose on hydrolysis." - This statement is incorrect. - **Option 3**: "Sucrose is dextrorotatory and gives levorotatory glucose and dextrorotatory fructose." - This statement is incorrect. - **Option 4**: "Sucrose is levorotatory and gives dextrorotatory glucose and levorotatory fructose on hydrolysis." - This statement is incorrect. 6. **Conclusion**: - The correct statement regarding sucrose is **Option 1**.
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