Question

Give a chemical test for distinguishing between any one of the Isomers of the pairs of CH₃CH=CHCH(OH)CH₃

Answer 1

Bromine decolourization test

Add a few drops of a solution of $Br_2$ in $CCl_4$ to a solution of each hydrocarbon in $CCl_4$.

The butane will not react (left-hand test tube). The but-2-ene will decolourize the bromine solution (right-hand test tube).