A hydrocarbon contains 7.70% hydrogen. 0.56L of the hydrocarbon weighs 1.95g at STP. Then hydrocarbon is an

Alkane

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alkene

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alkyne

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arene

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Solution

The correct option is D
arene

Arene
$\begin{matrix} E l e m e n t s & % & A t W t & % & R a t i o C & 92.3 & 12 & 7.66 & 1 H & 7.70 & 1 & 7.7 & 1 \end{matrix}$
Empirical formula = CH
22.4L at STP weight $= \frac{1.95}{0.56} \times 22.4 = 78$
$∴$ molar mass =78
Formula $= C_{6} H_{6}$ i.e. it is an arene

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