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General
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Question

 (B) and (C ) are:

  1.    
  2.    
  3.    
  4.    

The correct answer is:


    When both the C atoms are 2 degree as in compound (A) diborane preferentially attacks on the C atom with smaller (R) group and exclusive product arises from bonding at the C atom with smaller (R) group because bulky diborane is more sensitive to steric effects

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