Which of the following pairs contains ONLY molecules that possess at least one lone pair of electrons on the central atom AND have a net dipole moment of exactly zero?

Step-by-step solution

For a molecule to have a net dipole moment of zero despite having lone pairs on the central atom, the lone pairs and bond pairs must be arranged in a perfectly symmetrical geometry where all vector dipoles cancel out. BF ₃ and PCl ₅ both have a net dipole moment of zero, but neither boron nor phosphorus has any lone pairs in these molecules. XeF ₂ has sp^3d hybridization with 3 lone pairs occupying equatorial positions, resulting in a linear molecular geometry. The two Xe - F bond dipoles cancel exactly ( = 0 ). Xe