Assertion`:` A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of a little hydrochloric acid, it becomes laevaorotatory.
Reason `:` Sucrose on hydrolysis gives unequal amounts of glucose and fructose. As a result of this, change in sign of rotation is observed.

Options

A. If both assertion and reason are true , and is the true explanation of the assertion.
B. If both assertion and reason are true, but reason is not the true explanation of the assertion.
C. If asseration is true , but reason is false.
D. If both assertion and reason are false.

Answer

C

Explanation

Correct reason : Sucrose on hydrolysis gives equal amounts of glucose and fructose. Since fructose is more laevorotatory than glucose is dextrorotatory. Therefore , the resulting mixture becomes laevorotatory.