Chapter 8, Problem 8.56SP

Use VSEPR theory to answer the following questions:
(a) Which molecule, ${\text{BF}}_{\text{3}}$ or ${\text{PF}}_{\text{3}}$ , has the smaller $\text{F}—\text{X}—\text{F}$ angles?
(b) Which ion, ${\text{PCl}}_{\text{4}}{}^{+}$ or ${\text{ICl}}_{\text{2}}{}^{-}$ has the smaller $\text{Cl}—\text{X}—\text{Cl}$ angles?
(c) Which ion, ${\text{CCl}}_{\text{3}}{}^{-}$ or ${\text{PCl}}_{\text{6}}{}^{-}$ , has the smaller $\text{Cl}—\text{X}—\text{Cl}$ angles?