JEE Main levelSingle correct optionDifficulty 2 of 3bm025
Sucrose has specific rotation +66.5∘. Glucose has +52.5∘ and fructose has −92.4∘. Complete hydrolysis of sucrose gives an equimolar mixture of the two monosaccharides. The mixture is
Adextrorotatory, because both sucrose and glucose are dextrorotatory
Bdextrorotatory with rotation larger than sucrose
Clevorotatory, because the fructose contribution exceeds the glucose contribution
Doptically inactive
Answer: C
Average rotation =(52.5−92.4)/2=−19.95∘ (equal molar masses give equal masses at equal moles). The sign changes from positive to negative, which is called inversion, so the product is invert sugar.