Unsaturated organic compounds are identified by decolourization of

Chemistry

JAMB 2000

A. silver bromine and potassium tetraoxomanganate (VII) solutions
B. bromine water and acidified potassium tetraoxomanganate (VII) solution
C. silver bromide solution and bromine water
D. bromine water and alkaline potassium tetraoxomanganate (VII) solution

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Correct Answer: Option B

Explanation

Unsaturated organic compounds are identified by the decolorization of bromine water.The acidified potassium manganate(VII) solution oxidizes the alkene by breaking the carbon-carbon double bond and replacing it with two carbon-oxygen double bonds. The products are known as carbonyl compounds because they contain the carbonyl group, C=O. Thus, they are decolourized as well.

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