In an organic compound,the weight ratio of $C$,$H$,and $N$ atoms is $9 : 1 : 3.5$. If the molecular weight of the compound is $108$,what is its molecular formula?

  • A
    $C_2H_6N_2$
  • B
    $C_3H_4N$
  • C
    $C_6H_8N_2$
  • D
    $C_9H_{12}N_3$

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