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Simple Chemical Test May Be Used To Differentiate An Alkane From An Alkene?

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Add bromine in solution.
Alkane solution turns brown, alkene solution goes (brown then) colourless.
Bromine is brown; when it reacts with an alkene, the 2 bromines (from Br2) covalently bond with the two carbons in the alkene double bond (C=C). Since the bromine is now apart of another molecule, its brown colour is lost, so the alkene solution turns colourless.

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