What type of bond results from the uneven sharing of electrons in polar molecules?

The correct answer is the type of bond known as a polar covalent bond. In polar covalent bonds, electrons are shared unequally between two atoms with different electronegativities. This unequal sharing causes one atom to have a partial negative charge and the other to have a partial positive charge, leading to the polarity of the molecule.

This phenomenon occurs because the atom with higher electronegativity pulls the shared electrons closer to itself, creating a dipole moment. An illustrative example of this can be seen in the water molecule (H₂O), where the oxygen atom is more electronegative than the hydrogen atoms, leading to a polar covalent bond.

While an ionic bond involves the complete transfer of electrons from one atom to another, resulting in charged ions, and a hydrogen bond is a weak attraction between a hydrogen atom bonded to a highly electronegative atom and another electronegative atom, neither of these describes the uneven sharing characteristic of polar covalent bonds. Thus, the property of unequal electron sharing is what specifically defines a polar covalent bond.