Question
What is hydrogenation? What is its industrial application?
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$\text{Zn}\ +\ \text{HCl}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\text{ZnCl}_2\ +\ \text{H}_2$
$\text{PQ}\ +\ \text{RS}\xrightarrow{\ \ \ \ \ \ \ \ \ \ }\text{PS}\ +\ \text{RQ}$