Which of the following molecules will not participate in dipole-dipole interactions?

• A. CCl4
• B. CHCl3
• C. CO
• D. SO2

Answer: (A)

Verified step by step guidance

1. Understand that dipole-dipole interactions occur between molecules that have a permanent dipole moment, meaning the molecule must be polar.
2. Analyze the molecular geometry and electronegativity differences in each molecule to determine if it is polar or nonpolar:
3. - For CCl4, the molecule has a tetrahedral shape with four identical C-Cl bonds symmetrically arranged, which causes the bond dipoles to cancel out, making it nonpolar.
4. - For CHCl3, the molecule is tetrahedral but with three Cl atoms and one H atom, creating an asymmetry that results in a net dipole moment, so it is polar.
5. - For CO and SO2, both molecules have polar bonds and molecular geometries that do not cancel out the dipoles, so they are polar and will participate in dipole-dipole interactions.