question_answer

Reaction with bromine dissolved in \[CC{{l}_{4}}\]  or bromine water is used as a test for unsaturation both for alkenes and alkynes. Why?

Answer:

                Bromine is yellowish brown in colour. When vapours of an unsaturated hydrocarbon (alkene or alkyne) are passed through the solution of bromine in carbon tetrachloride or water, the product  formed is colourless. Thus, the colour of bromine gets discharged. Therefore, the reaction is