QJEEM25Chc96f: JEE Main 2025 Chemistry - Class 11 JEEM25Chc96f Solution: The hydrocarbon with molar mass and carbon has _______ degree…

Question

Verified Solution • 2025–26 Session moderate

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

Accepted Answer

Mass of carbon $=\frac{80 \times 90}{100}=72 \mathrm{gm}$

Number of C-atoms $=\frac{72}{12}=6$

Mass of hydrogen $=\frac{80 \times 10}{800}=8 \mathrm{gm}$

Number of H -atoms $=\frac{8}{1}=8$

So molecular formula $\mathrm{C}_6 \mathrm{H}_8$

D.U. $=6+1-8 / 2=7-4=3$

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