In chemistry, structural theory explains the large variety in chemical compounds in terms of atoms making up molecules, the order in which atoms are put together in molecules and the electrons that hold them together. Organic Chemistry is creative science that studies the structure, properties and reactions of compounds that contain carbon. We mainly study the structure, properties, composition, reactions and preparation by synthesis or by other means of carbon based compounds, hydrocarbons, and their derivatives. This one-term organic chemistry text is designed to help students see organic chemistry as an interesting and exciting science and to give them an opportunity to develop critical thinking skills. It engages students by presenting reactions with enough detail to give them a solid understanding of reactivity, rather than requiring rote memorization. The material is organised so that fundamental concepts are introduced early, then built on to provide an overview of the essentials of functional group chemistry and reactivity, leading the student to a solid understanding of the basics of organic chemistry. Contents: Stereoisomer’s Chemistry; Organic Stereochemistry; Structural Theory of Atom; Molecular Structures; Organic Structures and Compounds; Structural Isomerism in Organic Compounds; Structures of Protein in Organic Chemistry; DNA Structure in Organic Chemistry; Organic Natural Product; Organic Synthesis.