осуществите цепь превращений : CH4 =CH3CL = CH3OH = HCHO= HCOOH ПОМОГИТЕ
CH4 + Cl2 -> CH3-Cl + HCl
CH3-Cl + NaOH -> CH3-OH + NaCl
CH3-OH + CuO -> HCOH + Cu + H2O
HCOH + Ag2O -> HCOOH + 2Ag