(D) Mass of carbon $= \frac{80 \times 90}{100} = 72 \ g$. Number of $C$ atoms $= \frac{72}{12} = 6$. Mass of hydrogen $= 80 - 72 = 8 \ g$. Number of $

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(D) Mass of carbon $= \frac{80 \times 90}{100} = 72 \ g$. Number of $C$ atoms $= \frac{72}{12} = 6$. Mass of hydrogen $= 80 - 72 = 8 \ g$. Number of $H$ atoms $= \frac{8}{1} = 8$. So,the molecular formula is $C_6H_8$. Degree of Unsaturation $(D.U.) = C + 1 - \frac{H}{2} = 6 + 1 - \frac{8}{2} = 7 - 4 = 3$.