Question

An invert sugar is

• A. Isorotatory
• B. Levorotatory
• C. Dextrorotatory
• D. Optically inactive

Answer 1

Answer: (B)

Levorotatory

Answer 2

An invert sugar is laevorotatory. Sucrose is known as 'invert sugar'. After hydrolysis it gives dextrarotatory glucose and laevorotatory fructose. Since the laevorotation of fructose $\left(-92.4^{\circ}\right)$ is more than dextrarotation of glucose $\left(+52.5^{\circ}\right)$, the mixture obtained is laevorotatory.