Among the following reactions, the incomplete combustion of methane is:
| 1. | \(2 {CH}_4+{O}_2 \xrightarrow[]{\mathrm{Cu/523 \ K/100 \ atm}} 2 {CH}_3 {OH}\) |
| 2. | \({CH}_4+{O}_2 \xrightarrow[]{{Mo_{2}O_{3}}} {HCHO}+{H}_2 {O}\) |
| 3. | \(CH_4 + O_2 → C + 2H_2O\) |
| 4. | \(CH_4 + 2O_2 → CO_2 + 2H_2O\) |
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