Which of the following binary mixtures show positive deviation from Raoult's law?

AEthanol and cyclohexane
BAcetone and carbon disulfide
CChloroform and acetone
DPhenol and aniline

Answer: A, B

Positive deviation occurs when A-B attractions are weaker than A-A and B-B (hydrogen bonding of ethanol is disrupted by cyclohexane; carbon disulfide has no strong interaction with acetone). Chloroform with acetone and phenol with aniline form strong A-B attractions, giving negative deviation. Answer: 1 and 2.

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