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Nomenclature of Organic Compounds

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Estimated time: 6 minutes
  • Key Points: Rules of Nomenclature
CBSE: Class 12
CISCE: Class 10, 12

Key Points: Nomenclature of Organic Compounds

IUPAC naming provides a systematic way to name organic compounds based on their structure.

General format: 

IUPAC Name = Prefix + Word Root (Stem) + Suffix

  • Numbers: Indicate position of substituents
  • Prefix: Substituents (alkyl/functional groups)
  • Word Root: Number of carbon atoms in longest chain
  • Suffix: Principal functional group

IUPAC Rules:

Rule No. Rule Explanation
Rule 1 Longest Chain Select the longest continuous carbon chain as parent chain (not always straight).
Rule 2 Principal Chain Selection If chains are equal, choose the one with the maximum substituents (PCC).
Rule 3 Numbering Number chain to give the lowest locants to substituents/functional group.
Rule 4 Functional Group Priority Principal functional group gets lowest number, then multiple bonds, then substituents.
Rule 5 Multiple Substituents Use di-, tri-, tetra- for the same groups; these are not considered in alphabetical order.
Rule 6 Alphabetical Order Different substituents are written in alphabetical order; used to break numbering ties.
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