Assertion: Hydrolysis of sucrose brings about a change in sign of rotation from dextro to laevo. Reason: Hydrolysis always changes the optical rotation of a compound.

Question

Assertion: Hydrolysis of sucrose brings about a change in sign of rotation from dextro to laevo. Reason: Hydrolysis always changes the optical rotation of a compound. (A) If both assertion and reason are true and reason is the 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.

Tardigrade Admin · Accepted Answer

Sucrose is dextrorotatory but after hydrolysis gives dextrorotatory glucose and laevorotatory fructose. Since laevorotation of fructose (- 92.4°) is more than dextrorotation of glucose (+52.5°), hence the mixture is laevorotatory.

Q. Assertion : Hydrolysis of sucrose brings about a change in sign of rotation from dextro to laevo.
Reason : Hydrolysis always changes the optical rotation of a compound.

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If both assertion and reason are false.

Sucrose is dextrorotatory but after hydrolysis gives dextrorotatory glucose and laevorotatory fructose. Since laevorotation of fructose $(- 92. 4^{\circ})$ is more than dextrorotation of glucose $(+ 52. 5^{\circ})$ , hence the mixture is laevorotatory.

Q. Assertion : Hydrolysis of sucrose brings about a change in sign of rotation from dextro to laevo. Reason : Hydrolysis always changes the optical rotation of a compound.