Which one of the following substances would be the least soluble in CCl4? Which one of the following substance?

You have two questions, but I will only answer one of them.

Carbon Tetrachloride (CCl4) is a nonpolar molecule, which can be seen if you were to draw out its structure. A general rule of thumb is that like dissolves like, so the most polar compound is the one that is least soluble in CCl4. Water is the most most polar molecule out of the list, making it the least soluble in CCl4.