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Solution


Q.

The hydrocarbon (X) with molar mass 80 g mol-1 and 90% carbon has _____ degree of unsaturation.                   [2025]

Ans.

(3)

Mass of carbon in 80 g (i.e. 1 mol) hydrocarbon

                 =90100×80 g=72  g

Moles of C in 72 g (i.e. 1 mol) =7212 mol=6 mol

Mass of H in 80 g (i.e. 1 mol) hydrocarbon=(80-72) g=8  g

Moles of H in 80 g (i.e. 1 mol) hydrocarbon=81 mol=8 mol

So molecular formula is C6H8 i.e. degree of unsaturation = 3.