Q.
The hydrocarbon $(X)$ with molar mass $80\ g\ mol^{-1}$ and $90\%$ carbon has ...... degree of unsaturation.
Numerical Question
This is a numerical-answer question. The correct answer is shown below.
Explanation
[Solution by Dr. Abubacker] Carbon $=0.90\times80=72$ g $=6$ C atoms; hydrogen $=8$ g $=8$ H atoms. Formula $C_6H_8$. Degree of unsaturation $=\frac{2(6)+2-8}2=3$. Answer: 3.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.