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Question

Choose the correct statement when an alkene reacts with bromine in presence of CCl4


A
The color of solution changes from orange to blue 
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B
The color of solution stays orange
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C
The color of solution changes from colourless to orange
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D
The color of solution changes from orange to colourless
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Solution

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. 
Example: RCH2=CH2R+Br2CCl4RCH2BrCH2BrR


 

Chemistry

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