Assertion : D-glucose is dextrorotatory whereas L-glucose is laevorotatory.
Reason : D-compounds are always dextro and L-compounds are always laevorotatory

Options

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.

Answer

C

Explanation

D and L have no relation with the optical rotation. Carbohydrates having D configuration may be either dextrorotary or laevorotary e.g., D glucose is dextrorotatory while D-fructose is laevorotatory.