Question

Why ethene decolourises bromine water, but ethane not. (b) Write down the relevant chemical equation involved in decolourisation?

Answer 1

Ethene is an unsaturated compound. It has one double bond.When bromine water(brown in colour)is added to ethene it reacts with ethene to form a new compound 1,2 dibromethane which is colourless.The colou rof bromine water is gone.

Chemical Equation  : -


CH2 = CH2+ Br2  ----> BrCH2-CH2
Br