1. Формулы только алканов записаны в ряду
1) C2H4,C3H6,C4H8
2) C2H6,C3H8,C4H10
3) C2H2,C3H4,C4H6
4) C2H2,C2H4,C2H6

2.Гомологом метана является углеводород
1)C2H2
2)C3H8
3)C3H6
4)C2H4
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