Question

(+) and (-) forms of optically active compounds are different in
A. boiling points
B. melting points
C. specific gravity
D. specific rotation

Answer 1

Correct Answer - D
If a substance rotates the plane polarised light in clockwise direction, it is dextrorotatory (+). If it rotates the plane polarised light in anticlockwise direction then it is laevorotatory (-). Thus, +/- form differ in specific rotation.