1) [tex]CH_{4} + 2O_{2} = CO_{2} + 2H_{2}O[/tex]

2) [tex]2CH_{3}COOH + 2K = 2CH_{3}COOK + H_{2}[/tex]

3) [tex]C_{2}H_{5}OH + 3O_{2} = 2CO_{2} + 3H_{2}O[/tex]

4) [tex]2C_{2}H_{5}OH + 2K = 2C_{2}H_{5}OK + H_{2}[/tex]