Question

Give balanced chemical equations for the following conversions

$\mathrm{Bromoethane}\stackrel{\mathrm{E}}{\to }\mathrm{Ethane}\stackrel{\mathrm{F}}{\leftarrow }\mathrm{Sodium}\mathrm{propionate}$

Answer 1

Step 1 : Preparation of Ethane from Bromoethane:

1. Reduction of Bromoethane in the presence of Zn or Cu catalyst results in the formation of the desired product, that is, Ethane and Hydrogen bromide as a by-product.
2. The balanced chemical equation is represented as follows:

$$\begin{gathered} {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Br}\left(\mathrm{l}\right)+2\left[\mathrm{H}\right]\underset{\mathrm{Alcohol}}{\overset{\mathrm{Zn}/\mathrm{Cu}}{\to }}{\mathrm{C}}_2{\mathrm{H}}_6\left(\mathrm{g}\right)+\mathrm{HBr}\left(\mathrm{g}\right) \\ \mathrm{Bromoethane}\mathrm{Ethane}\mathrm{Hydrogen} \\ \mathrm{bromide} \end{gathered}$$

Step 2: Conversion of Ethane from Sodium propionate :

1. When Sodium propionate is heated with Sodium hydroxide in the presence of Calcium oxide, it results in the formation of the desired product, that is, Ethane and Sodium carbonate as a by-product.
2. The balanced chemical equation is represented as follows:

$$\begin{gathered} {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{COONa}\left(\mathrm{s}\right)+\mathrm{NaOH}\left(\mathrm{aq}\right)\underset{∆}{\overset{\mathrm{CaO}}{\to }}{\mathrm{C}}_2{\mathrm{H}}_6\left(\mathrm{g}\right)+{\mathrm{Na}}_2{\mathrm{CO}}_3\left(\mathrm{s}\right) \\ \mathrm{Sodium}\mathrm{Sodium}\mathrm{Ethane}\mathrm{Sodium} \\ \mathrm{propionate}\mathrm{hydroxide}\mathrm{carbonate} \end{gathered}$$

Step 3 :The complete balanced chemical equation for each conversion is represented as follows:

$$\begin{gathered} {\mathbf{C}}_{\mathbf{2}}{\mathbf{H}}_{\mathbf{5}}\mathbf{Br}\mathbf{}\left(l\right)\mathbf{}\mathbf{+}\mathbf{}\mathbf{2}\left[H\right]\mathbf{}\underset{\mathbf{Alcohol}}{\overset{\mathbf{Zn}\mathbf{/}\mathbf{Cu}}{\mathbf{\to }}}\mathbf{}{\mathbf{C}}_{\mathbf{2}}{\mathbf{H}}_{\mathbf{6}}\mathbf{}\left(g\right)\mathbf{}\mathbf{+}\mathbf{}\mathbf{HBr}\mathbf{}\left(g\right) \\ \mathbf{Bromoethane}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{Ethane}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{Hydrogen} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{bromide} \end{gathered}$$

$$\begin{gathered} {\mathbf{C}}_{\mathbf{2}}{\mathbf{H}}_{\mathbf{5}}\mathbf{COONa}\mathbf{}\mathbf{\left(}\mathbf{s}\mathbf{\right)}\mathbf{}\mathbf{+}\mathbf{}\mathbf{NaOH}\mathbf{}\mathbf{\left(}\mathbf{aq}\mathbf{\right)}\mathbf{}\underset{\mathbf{∆}}{\overset{\mathbf{CaO}}{\mathbf{\to }}}\mathbf{}{\mathbf{C}}_{\mathbf{2}}{\mathbf{H}}_{\mathbf{6}}\mathbf{}\mathbf{\left(}\mathbf{g}\mathbf{\right)}\mathbf{}\mathbf{+}\mathbf{}{\mathbf{Na}}_{\mathbf{2}}{\mathbf{CO}}_{\mathbf{3}}\mathbf{}\mathbf{\left(}\mathbf{s}\mathbf{\right)} \\ \mathbf{}\mathbf{}\mathbf{Sodium}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{Sodium}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{Ethane}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{Sodium} \\ \mathbf{propionate}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{hydroxide}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{carbonate} \end{gathered}$$

$\mathrm{Bromoethane}\underset{\mathbf{Alcohol}}{\overset{\mathbf{Zn}\mathbf{/}\mathbf{Cu}}{\to }}\mathrm{Ethane}\underset{\mathbf{∆}}{\overset{\mathbf{CaO}}{\leftarrow }}\mathrm{Sodium}\mathrm{propionate}$