The hydrocarbon $(X)$ with molar mass $80 \mathrm{~g} \mathrm{~mol}^{-1}$ and $90 \%$ carbon has…

The hydrocarbon $(X)$ with molar mass $80 \mathrm{~g} \mathrm{~mol}^{-1}$ and $90 \%$ carbon has $\ldots\ldots$ degree of unsaturation.

Solution


$\therefore$ Empirical formula is $\mathrm{C}_3 \mathrm{H}_4$
Molecular mass $=80 \mathrm{~g} \mathrm{~mol}^{-1}$.
Molecular formula $=\left(\mathrm{C}_3 \mathrm{H}_4\right)_{\mathrm{n}}$
$\mathrm{n}=\frac{\text { Molecular mass }}{\mathrm{EF} \text { mass }}=\frac{80}{40}=2$
$\therefore$ Molecular formula is $\mathrm{C}_6 \mathrm{H}_8$
Degree of unsaturation $=\frac{2 \times 6+2-8}{2}=3$

Asked in: JEE Main 2025 (24 Jan Shift 2)

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