7.
(1) $C{H_4} + C{l_2}\xrightarrow{{as}}C{H_3}Cl + HCl$
(2) $C{H_3}Cl + NaOH\xrightarrow{{{t^o}}}C{H_3}OH + NaCl$
(3) $C{H_3}OH + CuO\xrightarrow{{{t^o}}}HCHO + Cu + {H_2}O$
(4) $HCHO + \dfrac{1}{2}{O_2}\xrightarrow[{}]{{xt}}HCOOH$
8.
(1) ${\left( {{C_6}{H_{10}}{O_5}} \right)_n} + n{H_2}O\xrightarrow{{{H^ + }}}n{C_6}{H_{12}}{O_6}$
(2) ${C_6}{H_{12}}{O_6}\xrightarrow[{}]{{men}}2{C_2}{H_5}OH + 2C{O_2}$
(3) ${C_2}{H_5}OH + CuO\xrightarrow{{{t^o}}}C{H_3}CHO + Cu + {H_2}O$
(4) $C{H_3}CHO + {H_2}\xrightarrow[{{t^o}}]{{Ni}}{C_2}{H_5}OH$
9.
(1) ${C_2}{H_2} + {H_2}O\xrightarrow{{{H^ + }}}C{H_3}CHO$
(2) $C{H_3}CHO + {H_2}\xrightarrow[{{t^o}}]{{Ni}}{C_2}{H_5}OH$
(3) ${C_2}{H_5}OH + {O_2}\xrightarrow[{}]{{mengiam}}C{H_3}COOH + {H_2}O$
(4) $C{H_3}COOH + NaOH \to C{H_3}COONa + {H_2}O$
(5) $C{H_3}COONa + NaOH\xrightarrow[{{t^o}}]{{CaO}}C{H_4} + N{a_2}C{O_3}$
