\(\begin{gathered} 2C{H_4}\xrightarrow[{làm\,lạnh\,nhanh}]{{{{1500}^0}C}}{C_2}{H_2} + 3{H_2} \hfill \\ {C_2}{H_2} + {H_2}\xrightarrow{{Pd/PbC{O_3},{t^0}}}{C_2}{H_4} \hfill \\ {C_2}{H_4} + {H_2}\xrightarrow{{Ni,{t^0}}}{C_2}{H_6} \hfill \\ {C_2}{H_6} + C{l_2}\xrightarrow{{as}}{C_2}{H_5}Cl + HCl \hfill \\ \end{gathered} \)