Choose the correct statement when an alkene reacts with bromine in presence of CCl4 :
The color of solution changes from orange to blue
The color of solution stays orange
The color of solution changes from colourless to orange
The color of solution changes from orange to colourless
The correct option is D The color of solution changes from orange to colourless
This is a confirmatory test of alkenes or the test of unsaturation.
When an alkene is mixed with bromine in CCl4 its colour changes from orange to colorless. Bromine in CCl4 is a orange brown coloured solution. When bromine reacts with alkene it forms dibromoalkane by addition reaction, due to which orange colour disappears.