Which of the following physical properties differ for each of a pair of enantiomers

Enantiomers are molecules that are mirror images of each other but cannot be superimposed onto one another. Despite having the same chemical formula, enantiomers exhibit differences in their optical activity, which arises from their unique three-dimensional arrangement of atoms. Therefore, the physical property that differs for each pair of enantiomers is:

1. Optical Activity: Enantiomers rotate plane-polarized light in opposite directions. One enantiomer will rotate light in a clockwise direction (dextrorotatory or +), while the other will rotate it in a counterclockwise direction (levorotatory or -). This property is known as optical activity and is a result of the molecule's chirality, or lack of superimposability.