$2CH_4\buildrel{{1500^oC}}\over\to C_2H_2+ 3H_2$
$C_2H_2+ H_2\buildrel{{Pd/PbCO_3, t^o}}\over\to C_2H_4$
$C_2H_4+ H_2O\buildrel{{H^+, t^o}}\over\to C_2H_5OH$
$C_2H_5OH+ HCl \to C_2H_5Cl+ H_2O$
$C_4H_{10}\buildrel{{t^o, xt}}\over\to C_2H_6+ C_2H_4$
$C_2H_6\buildrel{{t^o, xt}}\over\to C_2H_4+ H_2$
$C_2H_4+ H_2O \buildrel{{H^+, t^o}}\over\to C_2H_5OH$
$C_2H_5OH+ CuO\buildrel{{t^o}}\over\to CH_3CHO+ Cu+ H_2O$