Question

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

Answer 1

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