CHEMISTRY · Single correct · A Level · Chemistry · Bonding · Bonding
Problem
In the molecule PF4Cl, no lone pairs are present on phosphorus. Which position will chlorine most likely occupy in the lowest-energy structure, and why?
(a) Any position, because all five sites are equivalent when no lone pairs are present.
(b) An equatorial position, because the larger Cl atom experiences fewer 90∘ repulsions there and has more space.
(c) An axial position, because the axial sites are farther from the other atoms and favor larger substituents.
(d) An axial position, because the higher electronegativity of Cl favors alignment with the molecular axis.