Question

(i) Which compound should be heated with soda lime to obtain ethane gas in the laboratory?
(ii) Write the equation for the reaction involved in the above question.
(iii) Write a balanced equation for the complete combustion of ethane.
(iv) Name a solid which can be used, instead of conc. H₂SO₄ to prepare ethylene by dehydration of ethanol.
(v) Name a reagent which can be used to distinguish between ethane and ethene.
(vi) Ethylene forms and addition product with chlorine. Name this addition product and write its structural formula.

Answer 1

(i) Sodium propionate (CH₃CH₂COONa)

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

(iii) $\underset{\mathrm{Ethane}}{2{\mathrm{C}}_2{\mathrm{H}}_6}+\underset{\mathrm{Air}\left(\mathrm{excess}\right)}{7{\mathrm{O}}_2}\to 4{\mathrm{CO}}_2+6{\mathrm{H}}_2\mathrm{O}+\mathrm{Heat}$

(iv) Alumina (Al₂O₃₎

(v) Bayer's reagent (alkaline KMnO₄)

(vi) Ethylene forms and addition product with chlorine. The name of the addition product is 1,2-Dichloroethane (ethylene chloride). The structural formula of 1,2-Dichloroethane is: