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Question

Sucrose is dextrorotatory but the mixture obtained after hydrolysis is laevorotatory. Explain.

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Solution

Sucrose is dextrorotatory. On hydrolysis, it produces a mixture of glucose and fructose having specific rotation +52.5 and 92.4. Thus, the respectively net resultant mixture become laevorotatory.
Hence, the mixture is laevorotatory and product is known as invert sugar.


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