The IUPAC nomenclature of organic chemistry is a systematic method of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry (IUPAC). Ideally, every possible organic compound should have a name from which an unambiguous structural formula can be created.
For ordinary communication, to spare a tedious description, the official IUPAC naming recommendations are not always followed in practice, except when it is necessary to give a concise definition to a compound, or when the IUPAC name is simpler (e.g. ethanol instead of ethyl alcohol). Otherwise the common or trivial name may be used, often derived from the source of the compound (see below). In addition, very long names may be less concise than structural formulae.
Read more about IUPAC Nomenclature Of Organic Chemistry: Basic Principles, Alkanes, Alkenes and Alkynes, Order of Precedence of Groups, Common Nomenclature - Trivial Names
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