$C_2H_4+H_2O\xrightarrow{{HCl, t^o}} C_2H_5OH$
$C_2H_4+3O_2\xrightarrow{{t^o}} 2CO_2+2H_2O$
$C_2H_4+Cl_2\to C_2H_4Cl_2$
$C_2H_4+HCl\to C_2H_5Cl$
$CH_4+2O_2\xrightarrow{{t^o}} CO_2+2H_2O$
$CH_4+Br_2\xrightarrow{{askt}} CH_3Br+HBr$
$2C_2H_2+5O_2\xrightarrow{{t^o}} 4CO_2+2H_2O$
$C_2H_2+Cl_2\to 2C+2HCl$
$CaC_2+2H_2O\to Ca(OH)_2+C_2H_2$