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  4. Which of the following can be used as the test for unsaturation with regard to colorchange of reaction?

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Q. Which of the following can be used as the test for unsaturation with regard to colorchange of reaction?

TS EAMCET 2020

Solution:

Addition of bromine can be used as the test for unsaturation with regard to colour change of reaction. e.g.
Unsaturated compound $+B r_{2} \rightarrow$ colour of $B r_{2}$ rapidly disappears.
i.e. Bromine water is decolourised.