How To Differentiate between Alkane and Alkene?

Alkanes and alkenes are organic compounds that may be found in many materials, including fuel and food. 

An alkane is a saturated hydrocarbon. It does not have any C=C double bond.

An alkene is an unsaturated hydrocarbon. It has a C=C double bond.

When reddish-brown bromine is added to an alkane, the solution will turn and remain reddish-brown. However, when bromine is added to alkene, its reddish-brown colour will become colourless.

The explanation for this may be viewed here. The video (without any audio) of the experiments may be seen below. Take a look!