The answer is attached below.
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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. Dimethyl indicates the presence of two methyl groups, both on carbon number 2.