Đáp án:
\(\begin{array}{l}
18.B\\
19.A\\
20.C
\end{array}\)
Giải thích các bước giải:
\(\begin{array}{l}
1.\\
a){C_2}{H_5}OH + K \to {C_2}{H_5}OK + \dfrac{1}{2}{H_2}\\
b)2C{H_3}{\rm{COOH + CaC}}{{\rm{O}}_3} \to {(C{H_3}{\rm{COO)}}_2}Ca + C{O_2} + {H_2}O\\
c)2C{H_3}{\rm{COOH + }}ZnO \to {(C{H_3}{\rm{COO)}}_2}Zn + {H_2}O\\
d){C_2}{H_4} + B{r_2} \to {C_2}{H_4}B{r_2}
\end{array}\)
\(\begin{array}{l}
2.\\
a){C_2}{H_5}OH + Na \to {C_2}{H_5}ONa + \frac{1}{2}{H_2}\\
b){C_2}{H_4} + B{r_2} \to {C_2}{H_4}B{r_2}\\
c){C_2}{H_6} + 6{O_2} \to 2C{O_2} + 3{H_2}O\\
d)2C{H_3}{\rm{COO}}H + Zn \to {(C{H_3}{\rm{COO}})_2}Zn + {H_2}
\end{array}\)
