<unk> , also known as ethyl bromide is a chemical compound of the haloalkanes group. It is abbreviated by chemists as EtBr.  This volatile compound has an ether-like odour.
Bromoethane
Chloroethane
Trichloroethylene
Tetrachloroethylene
Pentafluoroethane
Vinyl ether
Triphenylmethane
Methyl tert-butyl ether