Question

Write the equation for the following laboratory preparations:
(i) Ethane from sodium propionate.
(ii) Ethene from iodoethane.
(iii) Ethyne from calcium carbide.

Answer 1

(i) The equation of ethane from sodium propionate:

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

(ii) The equation for ethene from iodoethane:

$\underset{\mathrm{Iodoethane}}{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{I}}+\mathrm{KOH}\underset{∆}{\overset{\mathrm{alcohol}}{\to }}\underset{\mathrm{Ethene}}{{\mathrm{C}}_2{\mathrm{H}}_4}+\mathrm{KI}+{\mathrm{H}}_2\mathrm{O}$

(iii) The equation for the ethyne from calcium carbide:

$\underset{\mathrm{Calcium}\mathrm{carbide}}{{\mathrm{CaC}}_2}+2{\mathrm{H}}_2\mathrm{O}\to \underset{\mathrm{Ethyne}}{{\mathrm{C}}_2{\mathrm{H}}_2}+\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$