An organic compound is estimated through Dumus method and was found to evolve 6 mole of $\mathrm{CO}_{2}$ 4 moles of $\mathrm{H}_{2} \mathrm{O}$ and 1 mole of nitrogen gas. The formula of the compound is:

(C) $\mathrm{C}_{6} \mathrm{H}_{8} \mathrm{~N}_{2}$

(A) $\mathrm{C}_{12} \mathrm{H}_{8} \mathrm{~N}$

(B) $\mathrm{C}_{12} \mathrm{H}_{8} \mathrm{~N}_{2}$

(D) $\mathrm{C}_{6} \mathrm{H}_{8} \mathrm{~N}$

JEE Main · 2019 · 11 Jan 2019 · Shift 1 · Practical and Analytical Chemistry

An organic compound is estimated through Dumus method and was found to evolve 6 mole of

CO_{2}

4 moles of

H_{2} O

and 1 mole of nitrogen gas. The formula of the compound is:

(A) $C_{12} H_{8} N$
(B) $C_{12} H_{8} N_{2}$
(C) $C_{6} H_{8} N_{2}$ ✓ Correct
(D) $C_{6} H_{8} N$

Answer: (C)

Solution

In the Dumas method the carbon, hydrogen and nitrogen of the sample emerge as

CO X_{2}

H X_{2} O

and

N X_{2}

. Six moles of

CO X_{2}

mean six carbon atoms; four moles of

H X_{2} O

mean

4 \times 2 = 8

hydrogen atoms; one mole of

N X_{2}

means

1 \times 2 = 2

nitrogen atoms. The formula is therefore

C X_{6} H X_{8} N X_{2}

JEE Main · 2019 · 11 Jan 2019 · Shift 1 · Single correct option

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