Question

Write chemical tests to distinguish between ethane, ethene and ethyne.

Answer 1

Sr. No.	Test	Ethane	Ethene	Ethyne
1.	On adding a few drops of bromine solution in carbon tetrachloride (CCl4) to the hydrocarbon	No change is observed.	The reddish-brown colour of the bromine solution gets decolourised.	The reddish-brown colour of the bromine solution gets decolourised.
2.	On adding a few drops of ammoniacal cuprous chloride (CuCl2) to the hydrocarbon	No change is observed.	No change is observed.	Red precipitate of copper acetylide is formed.