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How is tetrabromoethane prepared from acetylene?

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Answer. When bromine water is added to acetylene, red-brown colour of bromine water is discharged rapidly due to formation of colorless tetrabromoethane.

                          Br    Br
HC≡CH +   2Br2   →  H-C — C-H                    
                            Br    Br
                         Tetrabromoethane
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