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Which of the following IUPAC names is correct for the compound? H3C – CH – CH – CH2 – CH3 | CH3 CH2CH3

1. 2-Methyl-3-ethylpentane
2. 3-Ethyl-2-methylpentane
3. 2-Ethyl-3-methylpentane
4. 3-Methyl-2-ethylpentane

Correct answer: 3-Ethyl-2-methylpentane

Solution

The correct IUPAC name is 3-Ethyl-2-methylpentane because the parent chain is pentane, and substituents are named in alphabetical order (ethyl before methyl) with the lowest possible locants.

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