Effect of Molecular Structure on Solubility
Non-polar liquids, like C6H6 (benzene) and CCl4, dissolve readily in other non-polar liquids, but not very readily in polar liquids.
Polar liquids, like HO-CH2-CH2-OH (ethylene glycol) and H2O, dissolve readily in other polar liquids, but not very readily in non-polar liquids.
Why is this the case? Hint: Analyze the solution process in terms of forces made and broken.