Question

What is bromine water test? What does it prove, explain with equation (if possible). ??????

Answer 1

• It’a the for unsaturation in organic compounds (alkanes and alkynes). If, say, 1cm3 of the compound is shaken with a few drops of bromine water, which is red/brown in colour, the bromine water is decolourised.
• Alkenes react in the cold with pure liquid bromine, or with a solution of bromine in an organic solvent like tetrachloromethane. The double bond breaks, and a bromine atom becomes attached to each carbon. ... If an aqueous solution of bromine is used ("bromine water"), you get a mixture of products.

Answer 2

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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 → C2H6If steam (H2O) is added to an alkene, an alcohol is made. For example: C2H4 + H2O → C2H5OH


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