Chapter 7 focuses on the exciting topic of stereochemistry. It discusses the effects of plane-polarized light on chiral molecules. Stereochemistry is a topic about the right-handedness or left-handedness of molecules that are mirror images, but nonsuperposable. Chiral molecules can have different chemical and medicinal properties. The chapter explores the specific rotations of chiral molecules, their descriptions as enantiomers or diastereomers, their absolute configurations, their chirality, and methods of possible resolution.