Выберите уравнение, которое правильно характеризует химические свойства метана: 1) СН4 + НВг = СН3Вг + Н2; 2) 2СН4 = С2Н2 + 3Н2; 3) СН4 + HNO3 = CH3ONO2 + H2O; 4) 3СН4 + 8КMnО4, = 3К2СO3 + 8MnO2↓ +2KOH + 5H2O.
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