Chapter 8.8, Problem 1CP

In which of the following species does the central atom not obey the octet rule?

$\begin{array}{l}\begin{array}{l}\text{a)}\hfill \\ {\text{ClO}}_{\text{2}}^{\text{-}}\hfill \\ \text{b)}\hfill \\ {\text{CO}}_{\text{2}}\hfill \\ \text{c)}\hfill \\ {\text{BrO}}_{\text{3}}^{\text{-}}\hfill \\ \text{d)}\hfill \\ \text{HCN}\hfill \\ \text{e)}\hfill \end{array}\\ {\text{ICI}}_{\text{4}}^{\text{-}}\end{array}$