The vapour pressure of mixture ( = 600 mm Hg) is greater than the individual vapour pressure o f its constituents (Vapour pressure of = 512 mm Hg, acetone = 344 mm Hg). Hence, the solution formed shows positive deviation from Raoult's law ⇒ (1) , (2) Raoult's law is not obeyed (3) Volume > 0 (4) and Acetone are less attracted to each ether than to themselves.