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# Ethylene dibromide ($C_2H_4Br_2$) and 1,2-dibromo propane ($C_3H_6Br_2$) form a series of ideal solution over the whole range of composition. At 85$^{\large\circ}$C, the vapour pressures of these pure liquids are 173 mm Hg and 127 mm Hg respectively.(b) Calculate the composition of the vapour in equilibrium with the above solution and express as mole fraction of ethylene dibromide

0.154
Hence (A) is the correct answer.