Question

Describe the Lab preparation of Acetone. What
happens when Acetone react with Chloroform.​

Answer 1

Explanation:

CHCl3 can be prepared in the laboratory by reaction of bleaching powder with ethanol or acetone. In this reaction, bleaching powder acts as an oxidizing chlorinating and hydrolyzing agent. A mixture of acetone, bleaching powder, and water, when heated produce chloroform. The reaction occurs in 3 steps.

Step-1: At first bleaching powder and water react to form chlorine and lime water [Ca(OH)2]

Ca(OCl)Cl (bleaching powder) + H2O → Ca(OH)2 Cl2

Step-2: Then the chlorine reacts with the acetone and by its chlorination 1, 1, 1-tri-chloroacetone is formed.

CH3-CO-CH3 (acetone) + Cl2 → Cl3C-CO-CH3 (1, 1, 1-trichloro acetone) + HCl

Step-3: The produced trichloro acetone reacts with lime forming chloroform.

Cl3C-CO-CH3 + Ca(OH)2 → CHC13 (chloroform) + (CH3COO)2Ca