Explanation:
\({\text{Stability}}{\mkern 1mu} {\mkern 1mu} \alpha \,\,\,\,\frac{{\text{1}}}{{{\text{Bond}}{\mkern 1mu} {\mkern 1mu} {\text{length}}{\mkern 1mu} \,\,{\text{b/n}}{\mkern 1mu} \,\,{\mkern 1mu} {\text{C - X}}}}\)
\(\therefore \,\,\,{\text{Stability}}\,\,{\text{order}}\,\,{\text{:}}\,\,\,{\text{C}}{{\text{F}}_{\text{4}}}{\text{ > }}\,{\text{CC}}{{\text{l}}_{\text{4}}}{\text{ > }}\,{\text{CB}}{{\text{r}}_{\text{4}}}{\text{ > }}\,{\text{C}}{{\text{I}}_{\text{4}}}\)