Question

Write balanced equations to show the preparation of the following:
(i) ethane from sodium propionate
(ii) ethene from ethanol
(iii) ethyne from calcium carbide
(iv) ethanoic acid from ethane

Answer 1

(i) Preparation of ethane from sodium propionate:

​$\underset{\mathrm{Sodium}\mathrm{propionate}}{{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{COONa}}+\mathrm{NaOH}\underset{∆}{\overset{\mathrm{CaO}}{\to }}\underset{\mathrm{Ethane}}{{\mathrm{C}}_2{\mathrm{H}}_6}+{\mathrm{Na}}_2{\mathrm{CO}}_3$

(ii) Preparation of ethene from ethanol:

​ ​$\underset{\mathrm{Ethanol}}{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}\underset{170°\mathrm{C}}{\overset{\mathrm{Conc}.{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}\underset{\mathrm{Ethene}}{{\mathrm{C}}_2{\mathrm{H}}_4}+{\mathrm{H}}_2\mathrm{O}$

(iii) Preparation of ethyne from calcium carbide:

​ ​ ​$\underset{\mathrm{Calcium}\mathrm{carbide}}{{\mathrm{CaC}}_2}+{\mathrm{H}}_2\mathrm{O}\to \underset{\mathrm{Ethyne}}{{\mathrm{C}}_2{\mathrm{H}}_2}+\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$

(iv) Preparation of ethanoic acid from ethane:

​$$\begin{gathered} \underset{\mathrm{Ethane}}{2{\mathrm{C}}_2{\mathrm{H}}_6}+{\mathrm{O}}_2\underset{200°\mathrm{C}}{\overset{\mathrm{Cu}}{\to }}\underset{\mathrm{Ethanol}}{2{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}} \\ {\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}+\left[\mathrm{O}\right]\underset{{\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7}{\overset{{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}\underset{\mathrm{Acetaldehyde}}{{\mathrm{CH}}_3\mathrm{CHO}}+{\mathrm{H}}_2\mathrm{O} \\ {\mathrm{CH}}_3\mathrm{CHO}+\left[\mathrm{O}\right]\underset{{\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7}{\overset{{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}\underset{\mathrm{Ethanoic}\mathrm{acid}}{{\mathrm{CH}}_3\mathrm{COOH}} \end{gathered}$$