Question

Which statement is FALSE? Molecules that contain a chiral carbon will rotate plane-polarized light. If one molecule rotates plane-polarized light clockwise 10°, its enantiomer will rotate plane-polarized light counterclockwise by 10°. The D- and L- designation of sugars is determined by the chiral atom farthest from the most oxidized carbon. All sugars designated with a D- prefix will rotate plane-polarized light in a clockwise direction. Dextrorotatory sugars rotate plane-polarized light clockwise and are designated by a plus sign (+).

Answer 1

this statement is FALSE

All sugars designated with a D- prefix will rotate plane-polarized light in a clockwise direction

Step-by-step explanation:

D and L designation of sugar is usually given to them based on the -OH group position. If present on the right side , it is always D and if present on the left side it is usually L. so we can say that D & L designation has nothing to do with light rotation whatsoever. Although a plane polarized light will be rotated by the sugar but the rotated direction can only be ascertain by experiment.

the statement is FALSE

All sugars designated with a D- prefix will rotate plane-polarized light in a clockwise direction