Hydrolysis of sucrose is called inversion because:
Correct answer: A. Its optical rotation sign changes from dextrorotatory (d) to laevorotatory (l)
- A. Its optical rotation sign changes from dextrorotatory (d) to laevorotatory (l)
- B. Its optical rotation sign changes from laevorotatory (l) to dextrorotatory (d)
- C. Optical rotation sign remains unchanged
- D. None of given options are correct
Explanation
The hydrolysis of sucrose is called an Inversion reaction because it results in a change in the sign of rotation of plane-polarized light from dextro (+) to laevo (-). Sucrose is a disaccharide composed of glucose and fructose molecules linked by a glycosidic bond. When sucrose is hydrolyzed with dilute acid or an enzyme called invertase, it gives an equimolar mixture of D(+) glucose and D(-) fructose. The laevorotation of fructose (-92.4°) is more than the dextrorotation of glucose (+52.5°), so the hydrolysis product has net laevorotation, resulting in the change in sign of rotation. The product is named as invert sugar because of this change in sign of rotation.
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