A compound of carbon ,hydrogen and nitrogen contains these elements in the ratio 9 : 1 : 3.5.Calculate the empirical formula.If its molecular mass is 108,what is the molecular formula ?

Question

$\begin{array}{1 1}(a)\;C_6H_8N_2&(b)\;C_4H_6N\\(c)\;C_2H_2N&(d)\;CH_4N\end{array}$