Some oxidation reactions of methane are given below. Which of them is/are controlled oxidation reactions?

1. CH4(g)+2O2(g)CO2(g)+2H2O(l)

2. CH4(g)+O2(g)Cl(s)+2H2O(l)

3. CH4(g)+O2(g)Mg2O3HCHO+H2O

4. 2CH4(g)+O2(g)Cu/523/100 atm2CH3OH


(3, 4)
Alkanes on heating with a regulated supply of dioxygen or air at high pressure and in the presence of suitable catalysts give a variety of oxidation products.
2CH4+O2Cu/523 K/100 atm2CH3OH
CH4+O2Mo2O3HCHO+H2O