MCQ
The ratio of the mass percentages of $'C$ $\&$ $H'$ and $'C$ $\&$ $O'$ of a saturated acyclic organic compound$'X'$ are $4 : 1$ and $3 : 4$ respectively. Then, the moles of oxygen gas required for complete combustion of two moles of organic compound $'X$' is
  • A
    $8$
  • B
    $10$
  • C
    $12$
  • $5$

Answer

Correct option: D.
$5$
d
$C : H =4: 1$

$C: O=3: 4$

Mass ratio

$C : H : O =12: 3: 16$

Mole ratio

$C : H : O =1: 3: 1$

Empirical formula $= CH _{3} O$

Molecular formula $= C _{2} H _{6} O _{2}$

(saturated acyclic organic compound)

$C _{2} H _{6} O _{2}+\frac{5}{2} O _{2} \longrightarrow 2 CO _{2}+3 H _{2} O$

$2\, mole$       $5 \,mol$

Moles of $O _{2}$ required $=5$ moles

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