Question

Write balanced chemical equation for the following:
(i) Monochloro ethane is hydrolysed with aqueous KOH.
(ii) A mixture of sodalime and sodium acetate is heated.
(iii) Ethanol under high pressure and low temperature is treated with acidified potassium dichromate.
(iv) Water is added to calcium carbide.
(v) Ethanol reacts with sodium at room temperature.

Answer 1

(i) When monochloroethane is hydrolysed with aqueous KOH, ethanol is obtained. The balanced chemical equation is:

$\underset{\mathrm{Monochloroethane}}{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}}+\underset{\mathrm{aqueous}}{\mathrm{KOH}}\to \underset{\mathrm{Ethanol}}{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}+\mathrm{KCl}$

(ii) When a mixture of sodalime and sodium acetate is heated, methane is obtained. The balanced chemical equation is:

$\underset{\mathrm{Sodium}\mathrm{acetate}}{{\mathrm{CH}}_3\mathrm{COONa}}+\mathrm{NaOH}\underset{∆}{\overset{\mathrm{CaO}}{\to }}\underset{\mathrm{Methane}}{{\mathrm{CH}}_4}+{\mathrm{Na}}_2{\mathrm{CO}}_3$

(iii) When ethanol under high pressure and low temperature is treated with acidified potassium dichromate, ethanoic acid is obtained. The balanced chemical equation is:

$\underset{\mathrm{Ethanol}}{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}\underset{{\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7/{\mathrm{H}}^{+}}{\overset{\left[\mathrm{O}\right]}{\to }}\underset{\mathrm{Ethanal}}{{\mathrm{CH}}_3\mathrm{CHO}}\stackrel{\left[\mathrm{O}\right]}{\to }\underset{\mathrm{Ethanoic}\mathrm{acid}}{{\mathrm{CH}}_3\mathrm{COOH}}$

(iv) When water is added to calcium carbide, ethyne is obtained. The balanced chemical equation is:

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

(v) When ethanol reacts with sodium at room temperature, sodium ethanoate is obtained. The balanced chemical equation is:

$\underset{\mathrm{Ethanol}}{2{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}+2\mathrm{Na}\to \underset{\mathrm{Sodium}\mathrm{ethanoate}}{2{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{ONa}}+{\mathrm{H}}_2$