What color change occurs when an alkane is mixed with bromine water?

When an alkane is mixed with bromine water, there is no color change observed. Bromine water, which is typically orange due to dissolved bromine, remains orange after being mixed with alkanes because alkanes are saturated hydrocarbons that do not undergo reactions with bromine in this context. Alkanes lack the double or triple bonds required to participate in an addition reaction, which is necessary for the bromine to react and decolorize.

In contrast, substances like alkenes or alkynes will cause the bromine water to turn from orange to colorless, as they react with bromine to form a dibromide compound. Other choices related to color changes such as yellow to clear or pale pink to dark pink refer to reactions with different substances or conditions that are not relevant to alkanes and bromine water. Thus, the behavior of alkanes with bromine results in no change in color, affirming that the correct response is that there is no observable change when mixing alkanes with bromine water.