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Ethyne to Ethane

Answer 1

Step 1: Conversion of Ethyne to Ethene

1. Ethyne on heating with Hydrogen in presence of Nickel catalyst forms Ethene.
2. The chemical reaction occurs as follows:
   $\underset{\left(\mathrm{Ethyne}\right)}{{\mathrm{C}}_2{\mathrm{H}}_2\left(\mathrm{g}\right)}+\underset{\left(\mathrm{Hydrogen}\right)}{{\mathrm{H}}_2\left(\mathrm{g}\right)}\underset{∆}{\overset{Ni}{\to }}\underset{\left(\mathrm{Ethene}\right)}{{\mathrm{C}}_2{\mathrm{H}}_4\left(\mathrm{g}\right)}$

Step 2: Conversion of Ethene to Ethane

1. Ethene further on heating with Hydrogen in presence of Nickel catalyst at $150°\mathrm{C}$ gives Ethane.
2. The chemical reaction occurs as follows:
   $\underset{\left(\mathrm{Ethene}\right)}{{\mathrm{C}}_2{\mathrm{H}}_4\left(\mathrm{g}\right)}+\underset{\left(\mathrm{Hydrogen}\right)}{{\mathrm{H}}_2\left(\mathrm{g}\right)}\underset{150°C}{\overset{Ni}{\to }}\underset{\left(\mathrm{Ethane}\right)}{{\mathrm{C}}_2{\mathrm{H}}_6\left(\mathrm{g}\right)}$

Step 3: Overall reaction

$\underset{\left(\mathrm{Ethyne}\right)}{{\mathrm{C}}_2{\mathrm{H}}_2\left(\mathrm{g}\right)}+\underset{\left(\mathrm{Hydrogen}\right)}{{\mathrm{H}}_2\left(\mathrm{g}\right)}\underset{∆}{\overset{Ni}{\to }}\underset{\left(\mathrm{Ethene}\right)}{{\mathrm{C}}_2{\mathrm{H}}_4\left(\mathrm{g}\right)}\underset{+{\mathrm{H}}_2}{\overset{\mathrm{Ni}∆}{\to }}\underset{\left(\mathrm{Ethane}\right)}{{\mathrm{C}}_2{\mathrm{H}}_6\left(\mathrm{g}\right)}$