Question

For the Following sets of compounds determine the best solvent, by looking at structure, also by looking at solubility vs. temp.
Which is the best solvent for crystalization, in which the compound is too soluble, and in which solvent the compound is not sufficiently soluble?
1. Comopund Phenanthrene Solvent: toulene, 95% ethyl alcohol, water
2. Compound: Cholesterol Solvent: Ether, 95% ethyl alcohol, water
3. Compound: Acetaminophen Solvent: toulene, 95% ethyl alcohol, water
4. Compound: Urea Solvent: Hexane, 95% ethyl alcohol, water

thank you