1/
$CH_2=CH-CH=CH_2+ HBr \buildrel{{40^oC}}\over\to CH_2Br-CH=CH-CH_3$
2/
$CaC_2+ 2H_2O \to Ca(OH)_2+ C_2H_2$
$C_2H_2+ Cl_2 \to 2C+ 2HCl$
$C+ 2H_2 \buildrel{{Pt, t^o}}\over\to CH_4$
$CH_4+ Cl_2 \buildrel{{as}}\over\to CH_3Cl+ HCl$
$2CH_4 \buildrel{{1500^oC}}\over\to C_2H_2+ 3H_2$
$C_2H_2+ 2H_2\buildrel{{t^o, Ni}}\over\to C_2H_6$
$C_2H_6+ Cl_2 \buildrel{{as}}\over\to C_2H_5Cl+ HCl$
$CH_3Cl+ C_2H_5Cl+ 2Na \buildrel{{xt, t^o}}\over\to CH_3-CH_2-CH_3+ 2NaCl$
$CH_3-CH_2-CH_3 \buildrel{{xt, t^o}}\over\to CH_2=CH-CH_3+ H_2$
