ORGANIC CHEMISTRY Chapter I o 1858-1861, Kekule, Couper, and Butlerov laid the basis for one of the most fundamental theories in chemistry: the structural theory Valence(化合价):C- tetravalent;O divalent:H-monovalent 9 A carbon atom can use one or more of its valences to form bonds to other carbon atoms C-C C-C C≡C ingle bone Double bond Triple bond o Organic chemistry: a study of the compounds of carbon. (Kekule) Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 1 1858 ~ 1861, Kekulé, Couper, and Butlerov, laid the basis for one of the most fundamental theories in chemistry: the structural theory. Valence（化合价）: C — tetravalent; O — divalent; H — monovalent. A carbon atom can use one or more of its valences to form bonds to other carbon atoms. C C C C C C Single bond Double bond Triple bond Organic chemistry: a study of the compounds of carbon. (Kekulé)