(i) 2-bromo-3-chlorobutane
(ii) 1-bromo-1-chloro-1, 2, 2-trifluoroethane
(iii) 1-bromo-4-chlorobut-2-yne
(iv) 2-(trichloromethyl)-1, 1, 1, 2, 3, 3-heptachloropropane
(v) 2-bromo-3, 3-bis (4-chlorophenyl) butane
(vi) 1-chloro-1-(4-iodophenyl)-3, 3-dimethylbut-1-ene.