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Coefficient of x to the power of r is 1 plus left parenthesis 1 plus x right parenthesis plus left parenthesis 1 plus x right parenthesis squared plushorizontal ellipsis plus left parenthesis 1 plus x right parenthesis to the power of n is

  1. left parenthesis n plus 3 right parenthesis subscript left parenthesis C subscript r right parenthesis    
  2. left parenthesis n plus 1 right parenthesis subscript C subscript r plus 1 end subscript end subscript
     
  3. n subscript C subscript r end subscript  
  4. left parenthesis n plus 2 right parenthesis subscript c subscript r end subscript

The correct answer is: left parenthesis n plus 1 right parenthesis subscript C subscript r plus 1 end subscript end subscript


    Because of the partial positive charge on adjacent N-atoms there is a repulsion along N  N bond, hence N  N bond distance become higher.

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