In the hydrogenation of double bonds,a catalyst is needed.In the second step,the reactants diffuse on the surface until they approach each other.This step is known as

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The step where the reactants diffuse on the surface until they approach each other is known as diffusion. This is the second step in the hydrogenation of double bonds, after the initial adsorption of the reactants onto the catalyst surface. The other options (adsorption, reaction, desorption) do not accurately describe this specific step in the process.

In the Hydrogenation of Double Bonds,a Catalyst Is Needed