A)`CH_3CHCl - 1^@` Alkyl halide halogenated .c. bonded to single carbon directily in `1^@` alkyl halide B) `CH_3CH_2MgCl`– Grignard reagent R-Mg-X Alkyl magnesium halide well known as gregnar.s reagent C) `C_2H_5Cl + C_2H_5ONa` – Alkylhalide and alkoxide mixture is used to prepare ether.s and the reaction is called Williamson.s synthesis D) Na + dry ether – Alkylhalide on reacting with sodium in dry ether gives alkanes this reaction is known as Wurtz reaction