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Fundamentals of Organic ChemistryChemistryBiomolecules

Cane sugar and invert sugar are:

Options

  1. Aboth dextrorotatory
  2. Bboth levorotatory
  3. Cdextrorotatory and levorotatory respectively
  4. Dlevorotatory and dextrorotatory respectively

Correct answer

C. dextrorotatory and levorotatory respectively

Step-by-step solution

Cane sugar (sucrose) is dextrorotatory with a specific rotation of +66.5^ . Upon hydrolysis, it yields an equimolar mixture of D-(+)-glucose (specific rotation +52.5^ ) and D-(-)-fructose (specific rotation -92.4^ ). Since the levorotation of fructose is greater in magnitude than the dextrorotation of glucose, the resulting mixture is levorotatory. This mixture is known as invert sugar. Thus, cane sugar is dextrorotatory and invert sugar is levorotatory. Answer: dextrorotatory and levorotatory respectively

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