Choose the Correct IUPAC Name for the Cycloalkane

What is the correct IUPAC name for the cycloalkane 1-isoethyl 2-methyl cyclopentane?

Explanation:

The correct IUPAC name for the compound originally referred to as 1-isoethyl 2-methyl cyclopentane is 1-ethyl-2-methylcyclopentane due to proper IUPAC nomenclature rules.

The IUPAC name for the compound 1-isoethyl 2-methyl cyclopentane is incorrect because 'isoethyl' is not a standard term in IUPAC nomenclature. However, the correct IUPAC name, considering the possible typos, is 1-ethyl-2-methylcyclopentane. This name follows the IUPAC naming rules for cycloalkanes, where when naming a cycloalkane with substituents, the carbon atoms of the ring are numbered such that the substituents receive the lowest possible numbers. The substituents are listed alphabetically when there are multiple substituents.

Therefore, given the substituents ethyl and methyl, the ring should be numbered such that the ethyl group is attached to the first carbon and the methyl group is at the second carbon, resulting in the name 1-ethyl-2-methylcyclopentane. This is option (a) in the provided choices.

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