Chapter 8, Problem 69QP

An atom of the following molecules does not obey the octet rule. Decide which atom violet the rule and explain the nature of the violation.

$\begin{array}{l}\text{(a)}{\text{SF}}_{\text{4}}\\ \text{(b)}{\text{BH}}_{\text{3}}\\ \text{(c)}{\text{XeF}}_{\text{6}}\\ \text{(d)}{\text{ClO}}_{\text{2}}\end{array}$