Q.

How many of the following compounds will decolorize bromine water?

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answer is 3.

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Detailed Solution

 

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  • The bromine loses its original red-brown color to give a colorless liquid. 
  • The decoloration of bromine is often used as a test for C-C double and triple bond.
  • Benzene does not react with any electrophilic addition reactions, hence it does undergo bromine water test, as they have delocalized pi bonds. 
  • Therefore, it does not decolorize the bromine water.
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