हिंदी

Distinguishing Test of Terminal and Non-Terminal Alkynes

Advertisements

Topics

Estimated time: 3 minutes
CBSE: Class 12

Key Points: Distinguishing Test of Terminal and Non-Terminal Alkynes

  • Terminal alkynes (R–C≡CH): have acidic hydrogen
  • With AgNO₃ in ammonia: 
    \[ \mathrm{R} - \mathrm{C} \equiv \mathrm{CH} \xrightarrow{\mathrm{AgNO}_3 + \mathrm{NH}_4\mathrm{OH}} \mathrm{R} - \mathrm{C} \equiv \mathrm{CAg} \downarrow + \mathrm{NH}_4\mathrm{NO}_3 \]
  • With ammonical Cu₂Cl₂ (Cu⁺): R – C ≡ CH → R – C ≡ C – Cu↓ → Red precipitate
  • Internal alkynes do NOT react with either reagent (no acidic H)
  • Acetylene (ethyne): gives both white ppt. with AgNO₃/NH₃ AND red ppt. with Cu₂Cl₂/NH₃
Advertisements
Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×