Question

What happens when (give balanced chemical equation and write the names of the reactants and products in each case):

Ethyne and hydrogen combine in the presence of a catalyst.

Answer 1

Step 1: Introduction

Ethyne $\left({\mathrm{C}}_2{\mathrm{H}}_2\right)$ gives an addition reaction with Hydrogen $\left({\mathrm{H}}_2\right)$ and Halogens because the triple bond is highly reactive.

Step 2: Reaction

The Ethyne reacts with two moles of Hydrogen $\left({\mathrm{H}}_2\right)$ in the presence of Palladium $\left(\mathrm{Pd}\right)$ catalyst to give Ethane $\left({\mathrm{C}}_2{\mathrm{H}}_6\right)$

The chemical reaction is given below:

$$\begin{gathered} \mathrm{H}-\mathrm{C}\equiv \mathrm{C}-\mathrm{H}+{\mathrm{H}}_2\stackrel{\mathrm{Pd}}{\to }{\mathrm{CH}}_2={\mathrm{CH}}_2 \\ \mathrm{Ethyne}\mathrm{Hydrogen}\mathrm{Ethene} \\ {\mathrm{CH}}_2={\mathrm{CH}}_2+{\mathrm{H}}_2\stackrel{\mathrm{Pd}}{\to }{\mathrm{CH}}_3-{\mathrm{CH}}_3 \\ \mathrm{Ethene}\mathrm{Hydrogen}\mathrm{Ethane} \end{gathered}$$