\(\begin{array}{l}
{C_2}{H_6} \to {C_2}{H_4} + {H_2}\\
{C_2}{H_4} + {H_2}O \to {C_2}{H_5}OH\\
{C_2}{H_5}OH \to {C_2}{H_4} + {H_2}O\\
3{C_2}{H_4} + 4{H_2}O + 2KMn{O_4} \to 2KOH + 2Mn{O_2} + 3{C_2}{H_4}{(OH)_2}\\
n(C{H_2} = C{H_2}) \to {( - C{H_2} - C{H_2} - )_n}\\
{C_2}{H_4} + HCl \to {C_2}{H_5}Cl
\end{array}\)