Addition of Bromine and Chlorine ■ Initial addition gives trans intermediate In the presence of excess reagent,a tetrahalide is obtained CHCH2 Br CH CH2C=CH Br2 Br2 CH2Cl2 CH2Cl2 CHCH2CBr2CHBr2 1-Butyne Br H 1,1,2,2-Tetrabromobutane (E)-1.2-Dibromo-1-butene Addition of Bromine and Chlorine „ Initial addition gives trans intermediate „ In the presence of excess reagent, a tetrahalide is obtained