Question:
An invert sugar is
An invert sugar is
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"Inversion of sugar" describes the process where a dextrorotatory reactant (sucrose) turns into a levorotatory product mixture upon hydrolysis.
Updated On: May 1, 2026
- Isorotatory
- Levorotatory
- Dextrorotatory
- Optically inactive
- Mutarotatory
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The Correct Option is B
Solution and Explanation
Concept: Invert sugar refers to the mixture of glucose and fructose obtained by the hydrolysis of sucrose. The name "invert" comes from the change (inversion) in the sign of optical rotation.
Step 1: {Check the optical rotation of sucrose.} Sucrose is dextrorotatory, having a specific rotation of $+66.5^{\circ}$.
Step 2: {Analyze the products of hydrolysis.} Hydrolysis yields an equimolar mixture of D-glucose ($+52.7^{\circ}$) and D-fructose ($-92.4^{\circ}$).
Step 3: {Calculate the net rotation of the mixture.} Since the levorotation of fructose is greater in magnitude than the dextrorotation of glucose, the final mixture has a net negative (levorotatory) rotation. $$\text{Net rotation} = (+52.7^{\circ}) + (-92.4^{\circ}) = -39.7^{\circ}$$ Thus, invert sugar is levorotatory.
Step 1: {Check the optical rotation of sucrose.} Sucrose is dextrorotatory, having a specific rotation of $+66.5^{\circ}$.
Step 2: {Analyze the products of hydrolysis.} Hydrolysis yields an equimolar mixture of D-glucose ($+52.7^{\circ}$) and D-fructose ($-92.4^{\circ}$).
Step 3: {Calculate the net rotation of the mixture.} Since the levorotation of fructose is greater in magnitude than the dextrorotation of glucose, the final mixture has a net negative (levorotatory) rotation. $$\text{Net rotation} = (+52.7^{\circ}) + (-92.4^{\circ}) = -39.7^{\circ}$$ Thus, invert sugar is levorotatory.
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