Number of molecules violating octet rule from the list given below

$$\begin{gathered} 1) \mathrm{CO} 6) {\mathrm{PCl}}_5 \\ 2) {\mathrm{CO}}_2 7) {\mathrm{SCl}}_4 \\ 3) {\mathrm{BF}}_3 8) {\mathrm{CCl}}_4 \\ 4) {\mathrm{BeCl}}_2 9) {\mathrm{IF}}_7 \\ 5) {\mathrm{SF}}_6 10) {\mathrm{O}}_2 \end{gathered}$$