Question

Give one chemical test to distinguish between ethane and ethene

Answer 1

add bromine solution to ethane and ethene
if bromine solution changes or discharges then it is ethene
if bromine solution remains same then it is ethane

Answer 2

we can test it with bromine water
in which if we will add ethene than the colour of bromine water will which will determine that ethene is unsaturated hydrocarbon.
where as with ethane the colour of bromine water will not change which will determine that ethane is a saturated hydrocarbon