This document discusses the physical and chemical properties of various vitamin coenzymes, including their structures and biological roles. It introduces classification of cofactors and coenzymes, then covers specific vitamin coenzymes such as thiamine, flavin, nicotinamide, pyridoxine, biotin, folic acid, cobalamin, lipoic acid, pantothenic acid, and quinones. For each one, it describes the vitamin name and number, molecular structure of the coenzyme forms, and their roles in biological processes.