Đáp án:
\(\begin{array}{l}
1\,B\\
2\,B\\
3\,B\\
4\,C\\
5\,D
\end{array}\)
Giải thích các bước giải:
\(\begin{array}{l}
1)\\
2{C_2}{H_5}OH + 2Na \to 2{C_2}{H_5}ONa + {H_2}\\
2{C_2}{H_5}OH + 2K \to 2{C_2}{H_5}ONa + {H_2}\\
2{C_2}{H_5}OH + Ba \to {({C_2}{H_5}O)_2}Ba + {H_2}\\
3)\\
2C{H_3}COOH + N{a_2}C{O_3} \to 2C{H_3}COONa + C{O_2} + {H_2}O\\
4)\\
2C{H_3}COOH + CuO \to {(C{H_3}COO)_2}Cu + {H_2}O\\
C{H_3}COOH + KOH \to C{H_3}COOK + {H_2}O\\
2C{H_3}COOH + Mg \to {(C{H_3}COO)_2}Mg + {H_2}
\end{array}\)
