Chapter 8, Problem 8.47SP

What shape do you expect for each of the following cations?
(a) ${\text{XeF}}_{\text{3}}{}^{+}$  (b) ${\text{SF}}_{\text{3}}{}^{+}$
(c) ${\text{ClF}}_{\text{2}}{}^{+}$  (d) ${\text{CH}}_{\text{3}}{}^{+}$