Alkane is a saturated hydrocabon. It does not have any C=C double bond.
Alkene is an unsaturated hydrocarhon. 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!
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