Ionic vs Covalent Bonding

Forgot everything over the break. Help?

Questions:
On the basis of the electronegativities of sodium, chlorine, carbon, hydrogen, and oxygen, which substance is the ionic solid?

What does a strong odor indicate about the ease with which the particles in a solid leave its surface?

Which of the two types of solids (Sodium Chloride, Camphor) seems to have the strong forces of attraction? Explain your answer.

How does the strength of van der Waals forces of attraction compare with the strength of attractions between ions of opposite charge?

Water is a much more polar molecule than 2-propanol. How does the polarity of the liquid seem to influence the suitabilities of these two solids?

Am I the only person that thinks that most of these questions dont make sense?

Although, logically, a stronger odour would indicate more particles. Hence, the stronger the odour, the easier it is for particles to leave the surface of the solid