chloromethane

Methyl chloride, a flammable gas once used as a refrigerant, with chemical formula CH₃Cl.

[…] by subjecting that compound to the action of chlorine in sunshine, whereby chloromethane, or methyl chloride, CH₃Cl, is produced, and distilling this chloride with potash.

Any of the chlorinated derivatives of methane.

Among the halogenated hydrocarbons, chloromethanes (i.e., methyl chloride, CH₃Cl; methylene chloride, CH₂Cl₂; chloroform, CHCl₃; and carbon tetrachloride, CCl₄) play a vital role due to their extensive uses as solvents and chemical intermediates.