Which of the following systems would provide the largest deviations from ideal solution behavior?
A. Methanol + ethanol
B. Benzene + toluene
C. n-hexane + 1-hexene
D. n-hexane + cyclohexane
E. 1-butanol + 1-pentanol
A. Incorrect. These molecules have similar sizes, shapes and functional groups.
B. Incorrect. Both are planar aromatic compounds. Toluene is simply benzene with a methyl group.
C. Incorrect. While a double bond can dramatically affect the properties of a straight chain hydrocarbon, 1-hexene’s double bond is at the end of the chain, minimizing its effects. Review the list again, since there is one system with significantly different components.
D. Correct. While having the same number of carbon atoms, one is cyclic and the other linear. These are not likely to mix ideally.
E. Incorrect. One additional CH2 group in the chain is not likely to significantly affect mixing behavior.
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