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A reagent used to test for unsaturntion of alkene is

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Ammoniacal ${Cu}_{2} {Cl}_{2}$

Ammoniacal ${AgNO}_{3}$

Solution of ${Br}_{2}$ in ${CCl}_{4}$

Conc. $H_{2} {SO}_{4}$

answer is D.

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Detailed Solution

Solution of bromine in carbon tetrachloride is used to test for unsaturation of alkene. Red colour of bromine disappears due to the formation of colourless dibromo ethane $(C_{2} H_{4} {Br}_{2}) .$

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