IUPAC nomenclature of organic compounds Class 11 Notes IUPAC nomenclature of organic compounds Class 11 Notes, iupac nomenclature class 11 pdf, rules for iupac nomenclature, nomenclature of organic compounds IUPAC rules for naming only alkane Longest chain rule Select the longest continuous chain of carbon atoms, which is regarded as parent chain & is given the name of parent hydrocarbon. If two chains of equal number of carbon atoms is identified, choose the one with maximum number of substituents (side chains) as parent chain. Lowest number rule Number the carbon atoms from the end that is nearest to the point of branching. The number which indicates the position of substituent is called locant. The sum of all the locants should be the lowest. Identify the substituents Assign number to each substituents according to its position on the parent chain. If two substituents are present on same carbon atom, assign them same number. There should be as many numbers in the na...