Five different substances are given to you to be dissolved in water. Which substances are most likely to undergo dissolution in water?

lithium iodide, LiI

sodium fluoride, NaF

potassium bromide, KBr

benzene, C6H6

hexane, C6H14

NaF and KBr

Explanation:

LiI comprises Li, a small highly polarizing positive ion and I-, a highly polarizable negative ion which tends towards covalent bond formation according to Fajan's rules hence may not be soluble in water. Benzene and hexane are organic substances which aren't soluble I water.