Q45Short answer
Sucrose is dextrorotatory but the mixture obtained after hydrolysis is laevorotatory. Explain.
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On hydrolysis sucrose (dextrorotatory), gives glucose (dextrorotatory, + 52.5°) and fructose (laevorotatory, – 92.4°). Since laevorotation of fructose is more than the dextrorotation of glucose, the mixture is laevorotatory.