Which of the following systems will most likely show the largest deviations from Raoult’s Law behavior?
A. Propane + 2-propanol
B. n-hexane + n-heptane
C. Benzene + toluene
D. 1-butanol + 2-butanol
E. 1,2-dimethyl cyclohexane + 1,3-dimethyl cyclohexane
A. Correct. An n-alkane (non-polar) with a substance that is polar and can hydrogen bond (2-propanol) will likely have the largest deviations from ideal solution behavior.
B. Incorrect. The only difference here is a slight one: an additional CH2 group in the chain. Both are of similar size, conformation and functional groups.
C. Incorrect. The addition of the methyl group to the aromatic ring does not greatly affect size or interactions.
D. Incorrect. This is a mixture of two alcohols of the same approximate length.
E. Incorrect. These are constitutional isomers and should exhibit small deviations from Raoult’s Law.
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