What is the correct IUPAC name for 1-chloro-2-methylpropane?

The name 1-chloro-2-methylpropane follows the IUPAC nomenclature rules for naming organic compounds, particularly the hierarchy for identifying the main chain and substituents.

In this case, the longest continuous carbon chain is propyl, consisting of three carbon atoms. The naming begins with the base name, which is derived from this longest chain. The presence of a chlorine substituent is indicated by the "chloro" prefix, and its position is denoted by the number 1, indicating that it is attached to the first carbon of the three-carbon propyl chain. The second substituent, a methyl group, is designated as being on the second carbon of the main chain.

So, according to the IUPAC rules, the name correctly conveys that one chlorine atom is attached to the first carbon of the propane chain, and a methyl group is attached to the second carbon. This format prioritizes clarity and precision in representing the structure of the molecule.

The other names do not correctly reflect the structure of the molecule as identified in this naming convention, as they either misplace the substituent designations or rearrange the order of the substituents in an unclear manner. Hence, the designation of