So this is the difference between ordered sequential reactions and random sequential reactions. And the underlying fact about these two reactions is that the two substrate molecules have to bind to the active side before that reaction actually takes place. So we have to form this three molecule structure known as the ternary structure. Now let's move on to the double displacement reaction, also sometimes known as a ping pong reaction. So what exactly is the major difference between the sequential reaction and the double displacement reaction? Well, just like the sequential reaction, this is the equation that generalizes the double displacement reaction.