Which statement is NOT true about polar covalent bonds?

• A. A dipole moment is often present in polar covalent bonds.
• B. Polar covalent bonds can be found in molecules like HCl.
• C. Electrons are shared equally between the two atoms.
• D. The atoms involved have different electronegativities.

Answer: (C)

Verified step by step guidance

1. Understand the definition of a polar covalent bond: it is a type of chemical bond where electrons are shared unequally between two atoms due to a difference in electronegativity.
2. Recall that a dipole moment arises when there is an uneven distribution of electron density, which is characteristic of polar covalent bonds.
3. Recognize that molecules like HCl have polar covalent bonds because hydrogen and chlorine have different electronegativities, causing unequal sharing of electrons.
4. Analyze the statement 'Electrons are shared equally between the two atoms' and compare it to the definition of polar covalent bonds; equal sharing corresponds to nonpolar covalent bonds, not polar ones.
5. Conclude that the statement 'Electrons are shared equally between the two atoms' is NOT true for polar covalent bonds because polar bonds involve unequal sharing due to differing electronegativities.