Classification and IUPAC nomenclature
General Organic Chemistry (GOC) · Chemistry
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Name CH₃–CH(CH₃)–CH₂–CH₃ by IUPAC rules. Step 1: Longest chain: 4 carbons → butane. Step 2: Substituent: methyl on carbon 2 (number to give lowest locant). Step 3: Alphabetical: only methyl — no ordering issue. Step 4: Name: 2-methylbutane. (Common name: isopentane.)