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Electrophilic addition reaction for ethylene gas with halogens

Electrophilic addition reaction for ethylene gas with halogens

Objective:  Electrophilic addition reaction for ethylene gas with halogens.

 

Introduction:

Alkenes react in the cold with pure liquid bromine, or with a solution of bromine in an organic solvent like tetra chloromethane. The double bond breaks, and a bromine atom becomes attached to each carbon. The bromine looses its original red-brown colour to give a colorless liquid. In the cases of the reaction with ethane 1,2-dibromoethane is formed. The reaction is below...

 

 

This discoloration of bromine is often used as a test for a carbon-carbon double bond.

 

Materials for experiment:

 

Chemicals:

  • ethylene gas
  • Carbon tetra chloride (CCl4)
  • solution of bromine in an organic solvent (Br2)

 

Apparatus:

 

  • Ethylene gas jar 
  • Protective musk
  • Spirit lamp
  • Br2  and CCl4 jar
  • A stirring rods

 

Reagent:

Ethylene gas takes in gas jar. Carbon tetrachloride and bromine mixture take ethylene gas jar.

 

Procedure:

  1. Ethylene gas takes in a reaction jar.
  2. Carbon tetrachloride and bromine mixture take in the reaction place.
  3. Wait a few moments and shake the jar for mixing of reactant.
  4. The discoloration of bromine is indicating that end of the reaction.

 

Observation:

The red colour of bromine completely discolored. This indicates that bromine is reacting with π electron. So Electrophilic addition reaction for ethylene gas with bromine occur.

 

Questions:

  1. What is electrophilic addition reaction?
  2. Why the red colour of bromine is discolored?
  3. Why ethylene saw electrophilic addition reaction?

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