Ch4-> ch3br-> c2h5-> c2h4-> c2h5oh-> ch3=o-h

CH4+Br2=CH3Br+HBr                          CH3Br-бромметан

2CH3Br+2Na=2NaBr+CH3-CH3              C2H6-этан

C2H6=C2H4+H2                                   C2H4-этен

C2H4+HOH=C2H5OH                           C2H5OH-этанол

C2H5OH+CuO=CH3-COH+Cu+H2O         CH3-COH-этаналь