Chapter 8, Problem 8.78SP

Which of the following substances would you expect to have a nonzero dipole moment? Explain, and show the direction of each.
(a) ${\text{Cl}}_{\text{2}}\text{O}$
(b) ${\text{XeF}}_{\text{4}}$
(c) Chloroethane, ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{Cl}$
(d) ${\text{BF}}_{\text{3}}$