Acetylene and butene have empirical formula $C H$ and $C H_{2}$ respectively. The molecular mass of acetylene and butene are 26 g and 56 g respectively. Deduce their molecular formula.

C_{2} H_{2}

and

C_{4} H_{6}

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C_{4} H_{8}

and

C_{2} H_{2}

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C_{2} H_{2}

and

C_{4} H_{8}

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C_{2} H_{4}

and

C_{4} H_{1} 0

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Solution

The correct option is D $C_{2} H_{2}$ and $C_{4} H_{8}$
Empirical mass of acetylene is 13.
Empirical mass $\times$ n=Molecular mass
$13 n = 26 ⟹ n = 2$ .
Molecular formula $= (C H)$ $\times$ $2 =$ $C_{2} H_{2}$
Empirical mass of butene is 14.
Empirical mass $\times$ n=Molecular mass
$14 n = 56 ⟹ n = 4.$
Molecular formula $=$ $(C H_{2}) \times$ $4 =$ $C_{4} H_{8}$

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