Question

Assertion $(A)$ A solution of sucrose in water is dextrorotatory while on hydrolysis in presence of little hydrochloric acid, it becomes laevorotatory.
Reason $(R)$ Sucrose on hydrolysis gives unequal amounts of glucose and fructose as a result of which change in sign of rotation is observed.

• A. If both Assertion and Reason are true and Reason is correct explanation of Assertion.
• B. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
• C. If Assertion is true but Reason is false.
• D. If both Assertion and Reason are false.

Answer 1

Answer: (C)

Sucrose on hydrolysis gives equal amount of glucose and fructose. Thus, fructose is more laevorotatory than glucose is dextrorotatory, therefore, the sign of rotation changes.