\(\begin{gathered}CaO + 3C\xrightarrow{{{{2000}^0}C}}Ca{C_2} + CO \hfill \\Ca{C_2} + 2{H_2}O \to Ca{(OH)_2} + {C_2}{H_2} \uparrow \hfill \\CH \equiv CH + HCl\xrightarrow[{150 - {{200}^0}C}]{{HgC{l_2}}}C{H_2} = CH - Cl \hfill \\nC{H_2} = CH - Cl\xrightarrow{{{t^0},p,xt}}{(C{H_2} - CHCl)_n} \hfill \\\end{gathered} \)
