At 35ºC, the vapour pressure of ${\mathrm{CS}}_2$, is 512 mm Hg and that of acetone is 344mm Hg. A solution of ${\mathrm{CS}}_2$ in acetone has a total vapour pressure of 600mm Hg. The false statement amongst the following is:

Raoult’s law is not obeyed by this system

${\mathrm{CS}}_2$ and acetone are less attracted to each other than to themselves

heat must be absorbed in order to produce the solution at 35ºC

a mixture of 100 mL ${\mathrm{CS}}_2$and 100 mL acetone has a volume of <200 mL