what test/s could be used to differentiate saturated and unsaturated hydrocarbons?

Question

explain how the test could differentiate them

Answer 1

Bromine solution goes from orange to colourless in an electrophilic addition reaction with alkenes, but not alkanes.

Now look it up!

Answer 2

The most commonly used one is the bromine test. The addition of bromine to the carbon-carbon double bond is very fast. The substitution that occurs with saturated hydrocarbons is very slow (and requires light and/or heat).

The other test (the Baeyer test) involves the reaction of KMnO4 (purple) with alkenes to form diols and MnO2 (brown).