Answer the following questions:
A chemistry teacher gives two colourless liquids, A and B, to Sonia. When bromine water is added, liquid A decolourises the solution immediately, while liquid B shows no change. On passing hydrogen gas over A in the presence of nickel catalyst, it behaves like B.
i. Define unsaturated compounds with examples.
Example:
ii. Which compound is saturated? Give a reason.
iii. Explain how bromine water can be used to distinguish between saturated and unsaturated carbon compounds.