What happens when bromine water is shook up with propane?

When bromine water is shaken up with propane, a reaction occurs where the bromine water decolorizes. This is because bromine water is a reddish-brown color and reacts with the unsaturated bonds in propane to form colorless products. The reaction is a test for unsaturation in organic compounds, as alkenes and alkynes can react with bromine water to form colorless compounds, while alkanes do not undergo this reaction and the color of the bromine water remains unchanged.