Question

both alkanes and alkenes react rapidly with aqueous bromine at room temperature​

Answer 1

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Answer 2

Alkanes and alkenes tend to be colourless. So, when bromine water is added to an alkane or alkene and mixed well, initially the mixture turns a red-brown colour due to the bromine. As the bromination reaction proceeds, the reaction mixture de-colourises (loses its red-brown colour).

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