\(\begin{gathered} a){C_2}{H_4}\xrightarrow[{xt}]{{ + {H_2}O}}C{H_3} - C{H_2} - OH\xrightarrow[{men\,giam}]{{ + {O_2}}}C{H_3}COOH \hfill \\ C{H_2} = C{H_2} + {H_2}O\xrightarrow{{xt}}C{H_3} - C{H_2} - OH \hfill \\ C{H_3} - C{H_2} - OH + {O_2}\xrightarrow{{men\,giam}}C{H_3}COOH + {H_2}O \hfill \\ b)C{H_2} = C{H_2}\left| \begin{gathered} \xrightarrow{{Dung\,dich\,B{r_2}}}C{H_2}Br - C{H_2}Br \hfill \\ \xrightarrow{{Trung\,hop}}{( - C{H_2} - C{H_2} - )_n} \hfill \\ \end{gathered} \right. \hfill \\ C{H_2} = C{H_2} + B{r_2} \to C{H_2}Br - C{H_2}Br \hfill \\ nC{H_2} = C{H_2}\xrightarrow{{Trung\,hop}}{( - C{H_2} - C{H_2} - )_n} \hfill \\ \end{gathered} \)
