Represent the single electron movement of $CH_3-Cl$ bond.

(N/A) The movement of a single electron is indicated by a single-barbed fishhook (i.e.,half-headed curved arrow).
In the homolytic cleavage of the $CH_3-Cl$ bond,each atom takes one electron from the shared pair,resulting in the formation of free radicals:
$CH_3-Cl \xrightarrow{\text{Homolytic cleavage}} \dot{CH_3} + \dot{Cl}$