$C{H}_{3}Cl$ primarily acts as an electrophile due to the positive polarization of chlorine when bonded to the methyl group, despite the chlorine's ability to attract electrons. The chlorine atom is negatively polarized near the carbon but positively polarized on the opposite side, making the entire molecule electrophilic. If chlorine were to lose an electron, it would form a $\ce{Cl-}$ ion, which would then act as a nucleophile. Chlorine typically does not exist as a standalone atom; it is usually found as a $\ce{Cl2}$ molecule, which is also electrophilic, or as a $\ce{Cl-}$ ion. Overall, the discussions clarify that while chlorine can exhibit nucleophilic behavior when ionized, in the context of $C{H}_{3}Cl$, it functions as an electrophile.