Answer:
For bromine, the dark red color disappears quickly as the atoms of bromine bond with the atoms of carbon in the double bond.
Explanation:
When bromine reacts with an alkene the bromine loses its reddish-brown color to colorless.
Alkenes are unsaturated hydrocarbon having one double bond (C = C) carbon to carbon. The general formula of alkene is CₙH₂ₙ. (where n is the number of carbon atoms).
Example:
CH₂ = CH₂ + Br₂ → CH₂Br - CH₂Br
Ethene Bromine 1,2-Dibromoethane
(reddish brown) (colourless)
From the above example we can see that by adding the alkene (Ethene) to the bromine water the bromine water turns colorless. Here the double bond between carbon (C = C) atoms breaks and form C-Br bonds.
This test is a confirmatory test of alkenes.
Thus, from the above conclusion we can say that When bromine reacts with an alkene the bromine loses its reddish-brown color to colorless.
Learn more about the Alkene here: https://brainly.com/question/23802223
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