Answer:
The prefix per implies that all the hydrogen atoms of a particular hydrocarbon have been replaced by F atoms. For example, \[C{{F}_{3}}{{(C{{F}_{2}})}_{6}}C{{F}_{3}}\] or \[\underset{\text{Perfluoroocetane}}{\mathop{C{{F}_{3}}-C{{F}_{2}}-C{{F}_{2}}-C{{F}_{2}}-C{{F}_{2}}-C{{F}_{2}}-C{{F}_{2}}-C{{F}_{3}}}}\,\]
Since F atom is strongly electronegative and has a very high negative electron gain enthalpy, C- F bond is of polar nature. With the increase in the number of F atoms around the carbon atom, the magnitude of \[+\delta \] charge on it increases and it acquires more electrostatic force of attraction for \[\delta \]-charge on F atoms. As a result, strength of C- F bond increases and perfluoro carbons become quite stable as well as inert.
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