In the hydrogenation of double bonds,a catalyst is needed.In the third step,the reactants react to form the product.This step is known as

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The third step, where the reactants react to form the product, is known as the reaction step. The other options - adsorption, diffusion, and desorption - are steps that may occur before or after the reaction step but are not the actual reaction itself.

In the Hydrogenation of Double Bonds,a Catalyst Is Needed