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Q.

When one mole of a hydrocarbon ‘A’ undergoes complete combustion. It requires 5 moles of oxygen and produces 4 moles of water. What is the molecular formula of A ?

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a

$C_{2} H_{6}$

b

$C_{2} H_{4}$

c

$C_{3} H_{6}$

d

$C_{3} H_{8}$

answer is B.

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Detailed Solution

$C_{x} H_{y} + (x + \frac{y}{4}) O_{2} \to x C O_{2} + \frac{y}{2} H_{2} O$
$x + \frac{y}{4} = 5$
$\frac{y}{2} = 4$
$∴ y = 8$
$x = 3$
$∴ C_{3} H_{8}$ Will be the formula of hydrocarbon A.

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When one mole of a hydrocarbon ‘A’ undergoes complete combustion. It requires 5 moles of oxygen and produces 4 moles of water. What is the molecular formula of A ?