An organic compound is estimated through Dumas method and was found to evolved 6 moles of $C O_{2}$ , 4 moles of $H_{2} O$ and 1 mole of nitrogen gas. The formula of the compound is

C_{6} H_{8} N

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C_{12} H_{8} N

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C_{12} H_{8} N_{2}

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C_{6} H_{8} N_{2}

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Solution

The correct option is D $C_{6} H_{8} N_{2}$
In Dumas method, organic compound is heated with dry cupric oxide in a combustion tube in the atmosphere of $C O_{2}$ and water vapours while $N_{2}$ is set free. Let, the molecular formula of the organic compound (1 mol) be $C_{x} H_{y} N_{z}$ . In Dumas method.

$C_{x} H_{y} N_{z} 1 m o l + (2 x + \frac{y}{2}) C u O \to x C O_{2} x m o l + \frac{y}{2} H_{2} O \frac{y}{2} m o l + \frac{z}{2} N_{2} \frac{z}{2} m o l + (2 x + \frac{y}{2}) C u N o w, x = 6, \frac{y}{2} = 4 \Rightarrow y = 8 a n d \frac{z}{2} = 1 \Rightarrow z = 2$
∴ Molecular formula of the compound is $C_{6} H_{8} N_{2}$ .

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