Which of the following binary mixtures shows negative deviation from Raoult's law?

AEthanol and water
BBenzene and toluene
CAcetone and chloroform
DAcetone and carbon disulfide

Answer: C

Acetone and chloroform form hydrogen-bond-like A-B attractions that are stronger than the A-A and B-B ones, so the vapour pressure is lower than the Raoult value. Ethanol-water and acetone-carbon disulfide show positive deviation, and benzene-toluene is nearly ideal.

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