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These structures for alkanes are made according to the nomenclature system rules set by the IUPAC. 1. The base name indicates the number of carbon atoms present in the longest continuous carbon chain. In this case, Pentane indicates 5 Carbon atoms. 2. The numbering of Carbon atoms starts from the left-hand side. 3. 3-Ethyl-3-Methyl indicates the presence of one Ethyl group and one Methyl group, both on carbon number 3.