What happens to bromine water when it is mixed with an alkane?

When bromine water is mixed with an alkane, there is no color change because alkanes are saturated hydrocarbons that do not readily react with bromine. Alkanes lack the multiple bonds (like double or triple bonds found in alkenes and alkynes) that are typically responsible for reactions that would decolorize bromine water. In contrast, alkenes react with bromine, resulting in a loss of color due to the formation of a brominated compound.

The other options describe reactions that may occur with other types of organic compounds, such as alkenes, which would change the color of bromine water. However, in the case of alkanes, the stability of their single bonds prevents them from undergoing such a reaction, hence resulting in no observable change in color when mixed with bromine water.