Chapter 11, Problem 5E

In which of the following, ${\text{CO}}_{\text{3}}^{\text{2-}}\text{,}{\text{SO}}_{\text{2}}\text{,}{\text{CCl}}_{\text{4}}\text{,}\text{CO,}{\text{NO}}_{\text{3}}^{\text{-}}$ , would you expect to find ${\text{sp}}^{\text{2}}$ hybridization of the central atom? Explain.