मराठी

Nomenclature of Haloalkanes and Haloarenes

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Estimated time: 3 minutes
CBSE: Class 12

Key Points: Nomenclature

Common Names:

  • Alkyl halide or aryl halide
  • e.g., CH₃Cl → Methyl chloride; CH₂=CHCl → Vinyl chloride

IUPAC Names:

  • Haloalkane or arylhalide
  • Rule 1: Find the longest carbon chain containing the halogen. If a double/triple bond is present, give it priority.
  • Rule 2: Number from the end nearer the first substituent. Assign each substituent a position number.
  • Multiple same halogens → di-, tri-, tetra- prefix.
  • Different halogens → list alphabetically and number to give the alphabetically first halogen the lowest possible number.

Examples:

  • CH₃Cl → Chloromethane
  • CH₂=CHCl → Chloroethene
  • (CH₃)₃CCl → 2-Chloro-2-methylpropane (common: tert-butyl chloride)
  • 2-Chloro-1-methylbenzene → o-Chlorotoluene → IUPAC: 1-Chloro-2-methylbenzene
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