Giải bài 3 trang 138 SGK Hoá học 11

$\begin{align} & 2C{{H}_{4}}\xrightarrow{{{1500}^{o}}C}{{C}_{2}}{{H}_{2}}+3{{H}_{2}} \\ & {{C}_{2}}{{H}_{2}}+{{H}_{2}}\xrightarrow[Pd,\,PbC{{O}_{3}}]{{{t}^{o}}}{{C}_{2}}{{H}_{4}} \\ & {{C}_{2}}{{H}_{4}}+{{H}_{2}}\xrightarrow[Ni]{{{t}^{o}}}{{C}_{2}}{{H}_{6}} \\ & {{C}_{2}}{{H}_{6}}+C{{l}_{2}}\xrightarrow{a\,s}{{C}_{2}}{{H}_{5}}Cl+HCl \\ \end{align}$