Unsaturated organic compounds are identified by decolourization of

The decolourization of bromine water and acidified potassium tetraoxomanganate (VII) solution is used to identify unsaturated organic compounds. When bromine water is added to an unsaturated organic compound, the brown color of bromine is decolorized due to the addition of bromine across the C=C double bond in the unsaturated compound. Similarly, when acidified potassium tetraoxomanganate (VII) solution is added to an unsaturated organic compound, the purple color of the solution is also decolorized due to the addition of the potassium tetraoxomanganate (VII) across the C=C double bond in the unsaturated compound. The decolorization of both these solutions is due to the reaction with unsaturated organic compounds, which is a characteristic test used to identify them. Therefore, the correct option is "bromine water and acidified potassium tetraoxomanganate (VII) solution".