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Q.

Br2 in CCl4  is added to propene. Then 1,2- dibromo propane is obtained. Here the intermediate is
 

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a

2° free radical

b

1° carbocation
 

c

2° carbocation
 

d

 cyclic bromonium ion
 

answer is C.

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Detailed Solution

detailed_solution_thumbnail
  • Addition of halogens to alkenes is an example of electrophilic addition reaction.
  •  It involves cyclic halonium ion formation.
  • Here, it forms cyclic bromonium ion. Then, the  Br−will attack the carbon from the back of bromonium ion result in anti-addition of 
    Br2 to the alkene.
  • Thus, addition of Br2 to alkenes is anti-addition.
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Br2 in CCl4  is added to propene. Then 1,2- dibromo propane is obtained. Here the intermediate is