a,
$C_2H_4+H_2O\buildrel{{H^+, t^o}}\over\to C_2H_5OH$
$C_2H_5OH+O_2\buildrel{{\text{men giấm}}}\over\to CH_3COOH+H_2O$
$CH_3COOH+C_2H_5OH\buildrel{{H_2SO_4, t^o}}\over\rightleftharpoons CH_3COOC_2H_5+H_2O$
$CH_3COOC_2H_5+H_2O\buildrel{{t^o}}\over\rightleftharpoons CH_3COOH+C_2H_5OH$
$2CH_3COOH+Ca\to (CH_3COO)_2Ca+H_2$
b,
$C_2H_4+H_2O\buildrel{{H^+, t^o}}\over\to C_2H_5OH$
$C_2H_5OH+O_2\buildrel{{\text{men giấm}}}\over\to CH_3COOH+H_2O$
$CH_3COOH+C_2H_5OH\buildrel{{H_2SO_4, t^o}}\over\rightleftharpoons CH_3COOC_2H_5+H_2O$
$CH_3COOC_2H_5+NaOH \buildrel{{t^o}}\over\to CH_3COONa+C_2H_5OH$
$2C_2H_5OH+2Na\to 2C_2H_5ONa+H_2$