Q9. Which sugar is called invert sugar? Why is it called so?
Answer: Sucrose is known as Invert Sugar. Sucrose is dextrorotatory but, after hydrolysis, gives dextrorotatory glucose and laevorotatory fructose. Since the laevorotation of fructose (−92.4o) is more than the dextrorotation of glucose (+52.5o), the mixture is a laevorotatory. Thus, the hydrolysis of sucrose changes the sign of rotation from dextro (+) to laevo (−), and the product is named invert sugar.
