State the various uses of:
$(i)$ Dichloromethane (Methylene chloride)
$(ii)$ Trichloromethane (Chloroform)
$(iii)$ Tri-iodomethane (Iodoform)
$(iv)$ Tetrachloromethane (Carbon tetrachloride)
$(v)$ Freons

(N/A) $(i)$ Dichloromethane $(CH_2Cl_2)$: It is used as a propellant in aerosols,as a process solvent in the manufacture of drugs,and as a metal cleaning and finishing solvent.
$(ii)$ Trichloromethane $(CHCl_3)$: Chloroform is used as a solvent for fats,oils,alkaloids,iodine,and other substances. Its major use is in the production of the refrigerant Freon $R-22$. It was once used as a general anaesthetic in surgery but has been replaced by less toxic,safer anaesthetics.
$(iii)$ Tri-iodomethane $(CHI_3)$: It was used earlier as an antiseptic,but its antiseptic properties are due to the liberation of iodine. Due to its objectionable smell,it has been replaced by other iodine-containing formulations.
$(iv)$ Tetrachloromethane $(CCl_4)$: It is used as a feedstock in the synthesis of chlorofluorocarbons and other chemicals,in pharmaceutical manufacturing,and as a general solvent. It was historically used as a cleaning fluid,degreasing agent,and fire extinguisher.
$(v)$ Freons: These are chlorofluorocarbon compounds of methane and ethane used as aerosol propellants,and in refrigeration and air conditioning. They are stable,non-toxic,non-corrosive,and easily liquefiable gases. Freon-$12$ $(CCl_2F_2)$ is a common industrial example produced via the Swarts reaction.