Такая нефиговая цепочка респект кто решит!!!
O O O O
// // // //
CH4->H-C ->H-C ->H-C ->H-C
| \ \ \ | \
| H OH O-CH3 | OH
| | O
\/ \/ //
CH3-OH->CH3Cl (H-C )Mg2
\
O

CH4+O2---(кат)-->HCHO+H2OHCHO+H2--->CH3OHCH3OH+HCl-->CH3Cl+H2OHCHO--[O]-->HCOOHHCOOH+CH3OH--->HCOOCH3+H2OHCOOCH3+H2O--->HCOOH+CH3OH 2HCOOH+Mg--->(HCOO)2Mg+H2