iupac nomenclature

Question

The IUPAC name of CH₃-CH(CH₃)-CH₂-CH₃ is:

RankGuru · Accepted Answer

To name the compound using IUPAC rules:
1. **Identify Longest Chain**: The longest continuous carbon chain has **4 carbons**, making the parent alkane **Butane**.
2. **Numbering**: Number from the end that gives the substituent the lower locant. Starting from the left gives the methyl group at position **2**.
3. **Assemble Name**: 2-Methylbutane.
- *Common Name*: Isopentane.
- *Note*: Numbering from the right would give 3-methylbutane, which is incorrect according to the lowest locant rule.

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