Compound in which all $C—N$ bond lengths are not same

  • A
    819-a416
  • B
    819-b416
  • C
    819-c416
  • D

    $\begin{array}{*{20}{c}}
      {HN = CH - C - CH = NH} \\ 
      {||} \\ 
      {\,\,\,C{H_2}} 
    \end{array}$

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