Question

equation of bromine water test ​

Answer 1

Answer:

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Answer 2

Answer:

Explanation:

Bromine water is an orange solution of bromine. It becomes colourless when it is shaken with an alkene. Alkenes can decolourise bromine water, but alkanes cannot. The slideshow shows this process.

The reaction between bromine and alkenes is an example of a type of reaction called an addition reaction. The bromine is decolourised because a colourless dibromo compound forms. For example:

ethene + bromine → dibromoethane

C2H4 + Br2 → C2H4Br2

Other addition reactions of alkenes:

Hydrogen can be added to a C=C double bond. This has the effect of ‘saturating’ the molecule, and will turn an alkene into an alkane. For example: C2H4 + H2 → C2H6

If steam (H2O) is added to an alkene, an alcohol is made. For example: C2H4 + H2O → C2H5OH