Describe Bromine Solution Test - QS Study
QS Study

Bromine Solution Test: Bromine is a liquid having a brown color. It is dissolved in carbon tetra-chloride and when an alkene is shaken with Br2 in CCl4 (red color); a colorless dibromide is formed. Discoloration takes place due to consumption of bromine from the solution. So, the discoloration of bromine is used to identify an unsaturation in alkenes. This test is called bromine solution test.

Example: When ethylene gas is passed through a 5% solution of bromine in carbon tetra-chloride, rapid decolourisation of the red color of bromine takes place due to the formation of colorless ethylene dibromide.