Intramolecular and Interparticle Force Practice Test

A solution is made by dissolving solid NaCl in water. Water is polar and can hydrogen bond; NaCl dissociates into Na$^+$ and Cl$^-$. What is the dominant intermolecular attraction between Na$^+$ ions and water molecules in the solution?

Two pure liquids are compared: hexane, C$6$H${14}$ (nonpolar; larger), and acetone, (CH$_3$)$_2$CO (polar; smaller). Which statement best describes why hexane can have a boiling point comparable to or higher than acetone despite being nonpolar?