Проделать цепочку првращений CH4 ->C2H2 -> CH3COH ->CH3CH2OH ->CH3CH2BR ->C2H4
2CH4=C2H2+3H2 C2H2+H2O=CH3CHO CH3CHO+H2=CH3CH2OH CH3CH2OH+HBr=CH3CH2Br+H2O CH3CH2Br+KOH=C2H4+KBr+H2O