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Basicity of Amines

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Estimated time: 2 minutes
Maharashtra State Board: Class 12

Key Points: Basicity of Amines

  • Basic nature: Amines are basic in nature, so they react with acids and form salts.
  • Basicity criterion: The larger the value of K_b or the smaller the value of pK_b, the stronger the base.
  • Order of pK_b values: NH₃ > R—NH₂ > R₂NH > R₃N.
  • Order of basic strength (aqueous): NH₃ < R—NH₂ < R₂NH < R₃N; in gaseous phase the order is 3° amine > 2° amine > 1° amine > NH₃.
  • Substituent effect on aniline: Electron-donating groups (—CH₃, —OCH₃) increase basicity, while electron-withdrawing groups (—CHO, —NO₂) decrease the basicity of aniline.
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