The following reaction depicts the activity of a particular class of enzymes :

Identify the enzyme class 'E' from the following options :

The given reaction shows the removal of groups $X$ and $Y$ from the substrate, resulting in the formation of a double bond ($C=C$) between the carbon atoms.

Enzymes that catalyze the removal of groups from substrates by mechanisms other than hydrolysis, leaving double bonds, are classified as lyases.

Therefore, the enzyme class 'E' is Lyases.

Answer: Lyases