Question

CH4-CH3Br-CH3OH-HCHO-HCOOH-HCOONa

Answer 1

CH₄ + Br₂ --> CH₃Br + HBr (nv)
CH₃Br + KOH --> CH₃OH + KBr
CH₃OH + CuO --> HCOH + H₂O + Cu (t)
HCOH + [O] --> HCOOH
HCOOH + NaOH --> HCOONa + H₂O