Chapter 108 of 2363 min read

IUPAC nomenclature

Why this is asked: When two numbering directions both give substituents low locants, the tie breaks at the first point of difference, not the lowest sum — a frequent numbering slip. The functional-group seniority order (roughly: acid > ester > amide > nitrile > aldehyde > ketone > alcohol > amine) decides which group becomes the suffix and which get demoted to prefixes like oxo- or hydroxy-.

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Test yourself

•A compound with the molecular formula $C_{6} H_{14}$ has two tertiary carbons. Its IUPAC name is:

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