Iodoform or tri-iodomethane, CHI₃

         Iodoform resembles chloroform in the methods of preparation and properties.

        Preparation

         (i) Laboratory preparation :

         From ethanol: 

         From Acetone: 

         Sodium carbonate can be used in place of KOH or NaOH. These reactions are called iodoform reactions.

         (ii) Industrial preparation : Iodoform is prepared on large scale by electrolysis of a solution containing ethanol, potassium iodide and sodium carbonate. The iodine set free, collected with ethanol in existence of alkali to form iodoform. The electrolysis taken out in existence of CO₂ and the temperature is maintained at 60-70°C.

         KOH is neutralised by CO₂:

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