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In compound $C,H,N$ atoms are present in 9 : 1 : 35 by weight .Molecular weight of compound is 108.It molecular formula is

$\begin{array}{1 1}(a)\;C_2H_6N_2&(b)\;C_3H_4N\\(c)\;C_6H_8N_2&(d)\;C_9H_{12}N_3\end{array}$

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9+1+3.5=13.5
$13.5g$ contain $\large\frac{9}{12}$ mole carbon
$108g$ contain =$\large\frac{9\times 108}{12\times 13.5}$
$\Rightarrow$ 6 mole C
(i.e) $C_6H_8N_2$
Hence (c) is the correct answer.
answered Oct 28, 2013 by sreemathi.v
 

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