<unk>  or monochloroethane, commonly known by its old name ethyl chloride, is a chemical compound once widely used in producing tetra-ethyl lead, a gasoline additive.  It is a colorless, flammable gas or refrigerated liquid with a faintly sweet odor.
Chloroethane
Trichloroethylene
Bromoethane
Tetrachloroethylene
Dichloroacetic acid
Triphenylmethane
Pentafluoroethane
Nitrazine