Classify each substance based on the intermolecular forces present in that substance.

Question

Hydrogen bonding, dipole–dipole, and dispersion Dipole–dipole and dispersion only. Dispersion only

1. HF
2. CO
3. He
4. CH3Cl

Answer 1

H–F has a polar bond to an H atom, so

hydrogen bonding, dipole–dipole, and dispersion

C≡O is tricky because the CO bond is essentially nonpolar despite the electronegativity difference between C and O. The dipole resulting from this

electronegativity difference is counterbalanced by electron donation from O to C. So

dispersion only

He had no bonds, therfore no polar bonds, so

dispersion only

H₃C–Cl has a polar C–Cl bond, but neither atom is a H, so

dipole–dipole, and dispersion