$CH \equiv CH+HOH \overset{H_2SO_4}{\rightarrow} CH_3-CHO$
$CH_3-CHO +\frac{1}{2}O_2 \xrightarrow[t^0]{Mn^{2+}}CH_3-COOH $
$CH_3COOH+Na \rightarrow CH_3COONa+\frac{1}{2}H_2 \uparrow $
$CH_3COONa+NaOH \xrightarrow[t^0]{CaO} CH_4+Na_2CO_3$
Cách khác :
$2CH \equiv CH \xrightarrow[t^0]{xt} CH_2=CH-C \equiv CH$
$CH_2=CH-C \equiv CH+3H_2 \xrightarrow[t^0]{Ni} CH_3-CH_2-CH_2-CH_3$
$CH_3-CH_2-CH_2-CH_3 \xrightarrow[t^0]{crack} CH_4+C_3H_6$