Now let's look at a double displacement or a metaphor reaction. Now, we have reactance A and B react with reactants CD. What happens now is our C displaces this B kicks off this B, forming a bond with a, and at the same time, this B kicks off this C, forming a bond with D. And what we get is the following. Or an example of this is the following. Now, notice what happened. This hydroxide in our first reactant kicked off this so four molecule, forming a bond with H and forming our first product, our water molecule.