Помогите решить цепочку химических превращений

1) C2H6→C2H5OH→CH3COH→CH3COOH
2) C3H8→2ClC3H8→C3H7OH
3) C2H4→C2H5Cl→C2H5OH→C2H4
4) метан → формальдегид → метанол → уксусная кислота → угольная кислота

№1C2H6->C2H5OH->CH3COH->CH3COOHC2H6 + Сl2 = C2H5Cl + HCl C2H5Cl + KOH = C2H5OH + KClC2H5OH + CuO = CH3COH + Cu + H2O CH3COH + Ag2O = CH3COOH +2Ag№3C2H4->C2H5Cl->C2H5OH->C2H4C2H4+HCl=C2H5Cl+HClC2H5Cl+NaOH=C2H5OH+NaClC2H5OH=C2H4+H2O№4CH4->CH2O->CH3OH->CH3COOH->H2CO3CH4+O2=CH2O+H2OCH2O+Cu+H2O=CH3OH+CuOCH3OH+CO=CH3COOHCH3COOH + NaHCO3 =CH3COONa + H2O + CO2