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)CH4(g)+2O2(g)→CO2(g)+2H2O(l)
2. CH4(g)+O2(g)→Cl(s)+2H2O(l)CH4(g)+O2(g)→Cl(s)+2H2O(l)
3. CH4(g)+O2(g)Mg2O3→HCHO+H2O
4. 2CH4(g)+O2(g)Cu/523/100 atm→2CH3OH
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