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.

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Solution

Step 1: Introduction
Ethyne $(C_{2} H_{2})$ gives an addition reaction with Hydrogen $(H_{2})$ and Halogens because the triple bond is highly reactive.
Step 2: Reaction
The Ethyne reacts with two moles of Hydrogen $(H_{2})$ in the presence of Palladium $(Pd)$ catalyst to give Ethane $(C_{2} H_{6})$
The chemical reaction is given below:
$H - C \equiv C - H + H_{2} \overset{Pd}{\to} {CH}_{2} = {CH}_{2} Ethyne Hydrogen Ethene {CH}_{2} = {CH}_{2} + H_{2} \overset{Pd}{\to} {CH}_{3} - {CH}_{3} Ethene Hydrogen Ethane$

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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.

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.