во первых...мышьяк однозначно лишний
1. 2СН4 -> C2H2 + 3H2
2. С2H2 + H2O -> CH3-CHO
3. CH3-CHO + H2 -> CH3-CH2-OH
4. CH3-CH2-OH + HBr -> CH3-CH2-Br + H2O
5. CH3-CH2-Br + NaOH -> CH3-CH2-OH + NaBr
6. CH3-CH2-OH + CuO -> CH3-CHO + Cu + H2O
7. CH3- CHO + Ag2O -> CH3- COOH + 2Ag
8. CH3-COOH + NaOH -> CH3-COONa + H2O
во первых...мышьяк однозначно лишний
1. 2СН4 -> C2H2 + 3H2
2. С2H2 + H2O -> CH3-CHO
3. CH3-CHO + H2 -> CH3-CH2-OH
4. CH3-CH2-OH + HBr -> CH3-CH2-Br + H2O
5. CH3-CH2-Br + NaOH -> CH3-CH2-OH + NaBr
6. CH3-CH2-OH + CuO -> CH3-CHO + Cu + H2O
7. CH3- CHO + Ag2O -> CH3- COOH + 2Ag
8. CH3-COOH + NaOH -> CH3-COONa + H2O