Question

How does isopropyl alcohol differ from water in polarity?

Answer 1

To a first approximation, isopropyl alcohol is HALF a water molecule.

Explanation:

And thus isopropyl alcohol is expected to have some polarity, and SOME water solubility. It is hard to find some metric to compare polarity, and in these cases, usually, we find that we report solubility of the solvent in other solvents. Methanol and ethanol are infinitely miscible in water. Methanol is IMMISCIBLE in hexanes. On the other water isopropyl alcohol is miscible with water, and miscible with hexanes, and with many other organic solvents.