While the C-Cl bond is polar, the vector sum of the bond dipoles determines the overall molecular dipole moment. In CCl₄, the tetrahedral symmetry causes the bond dipoles to cancel out, resulting in a zero dipole moment. CH₃Cl has the highest dipole moment among the polar chloromethanes. [cite: 577, 578, 579, 581, 582, 583, 584, 585, 586, 587]