Organic chemistry is a branch of chemistry that studies the structure, properties and reactions of organic compounds, which contain carbon in covalent bonding. Study of structure determines their chemical composition and formula.Organic chemistry is the study of the structure, properties, composition, reactions, and preparation of carbon-containing compounds, which include not only hydrocarbons but also compounds with any number of other elements, including hydrogen (most compounds contain at least one carbon–hydrogen bond), nitrogen, oxygen Organic chemistry is the most dreaded of all science classes. It has the highest failure rate, lowest class average and more retakes than any other science course. Yet most schools weigh organic chemistry about the same as general chemistry or physicsIts biochemistry + more math and physics (more inorganic chemistry too). Its 'harder' than a biochem major but that depends on what kind of person you are. Also ChemE's have more versatile job prospects and get paid better on average. ... At my university, students in chemistry usually end up in materials chemistry Biochemistry is hard, because it assumes you know a lot of relatively knew knowledge. ... Biochem uses organic chemistry, a class you take in college. Hell you might take biochem right after it. Biochem uses cellular and molecular biology.