Question

State what do you observe when Ethene is bubbled through a solution of Bromine in Carbon tetrachloride.

Answer 1

• Ethene$\left({\mathrm{C}}_2{\mathrm{H}}_4\right)$ is an unsaturated hydrocarbon as it contains carbon-carbon double bond $\mathrm{C}=\mathrm{C}$.
• When Ethene$\left({\mathrm{C}}_2{\mathrm{H}}_4\right)$ is added to the orange-colored Bromine$\left(\mathrm{Br}\right)$ solution in the presence of Carbon tetrachloride$\left({\mathrm{CCl}}_4\right)$, due to the formation of Ethylene bromide$({\mathrm{BrCH}}_2-{\mathrm{CH}}_2\mathrm{Br})$, the bromine solution becomes colorless.
• The chemical reaction is as follows

$\underset{\mathrm{Ethene}}{{\mathrm{CH}}_2={\mathrm{CH}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{Bromide}}{{\mathrm{Br}}_2\left(\mathrm{g}\right)}\stackrel{{\mathrm{CCl}}_4}{\to }\underset{\mathrm{Ethylene}\mathrm{bromide}}{{\mathrm{BrCH}}_2-{\mathrm{CH}}_2\mathrm{Br}\left(\mathrm{g}\right)}$