(1) $2CH_4\xrightarrow{{1500^oC}} C_2H_2+3H_2$
(2) $2C_2H_2\xrightarrow{{CuCl, NH_4Cl, t^o}} CH\equiv C-CH=CH_2$
(3) $CH\equiv C-CH=CH_2+H_2\xrightarrow{{Pd/PbCO_3, t^o}} CH_2=CH-CH=CH_2$
(4) $CH_2=CH-CH=CH_2+2H_2\xrightarrow{{Ni, t^o}} CH_3-CH_2-CH_2-CH_3$
(5) $C_4H_{10}\xrightarrow{{xt, t^o}} CH_4+CH_3-CH=CH_2$
(6) $nCH_3-CH=CH_2\xrightarrow{{t^o, p, xt}} (\kern-6pt- CH_2-CH(CH_3) )\kern-6pt-_n$
