Polarity is a measure of the uneven distribution of electrons within a molecule, resulting in a positive and negative end.

Pentane (C5H12) is a nonpolar molecule because it consists only of carbon and hydrogen atoms, which have similar electronegativity. The molecule is symmetrical and the electron distribution is relatively even.

Isopropyl alcohol (CH3CHOHCH3) is a polar molecule due to the presence of an oxygen atom which is more electronegative than carbon and hydrogen. This creates a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atom attached to it. The resulting dipole moment makes isopropyl alcohol polar.

In summary:

* Pentane: Nonpolar

* Isopropyl alcohol: Polar

Therefore, isopropyl alcohol is more polar than pentane.