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It concludeswith a brief survey of the various topics in organic chemistry and a description ofthe way that we present them in this text. 1.1 Organic Molecules All organic molecules contain carbon (C) , virtually all of them contain hydrogen(H) , and most contain oxygen (O) and/or nitrogen (N) atoms.
Most of the molecules detected so far are organic. Only one inorganic species has been observed in molecules which contain at least five atoms, SiH 4. Larger molecules have so far all had at least one carbon atom, with no N-N or O-O bonds.