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Rules for IUPAC Nomenclature of Branched Saturated Hydrocarbons

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Estimated time: 4 minutes
Maharashtra State Board: Class 12

Key Points: Rules for IUPAC Nomenclature of Branched Saturated Hydrocarbons

  1. Longest chain rule — The longest continuous C–C linkage is the parent chain
  2. Lowest locant rule — Number the parent chain from the end that gives substituents the lowest possible locant numbers
  3. Alphabetical order rule — When multiple substituents are present, name them in alphabetical order (ignoring multiplying prefixes like di, tri)
  4. First point of difference rule — If functional groups are at equivalent positions, number so that the first different locant is the lowest
  5. Complex group rule — For branched side chains, the carbon through which the complex group is attached to the main chain is always given locant number 1
  6. Double and triple bond priority — If both are at equal distance from ends, double bond is preferred; if asymmetrical, use lowest locant sum rule then first point of difference rule
  7. Multiple functional groups — Priority order: –COOH > –SO₃H > –COOR > –COCl > –CONH₂ > –CN > –CHO > C=O > –OH > –NH₂ > C=C > –C≡C–
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