I understood that, however in the example given, bromination will destroy the chirality center, so in this case will give a racemic product, 1,2-dibromo-2-methylbutane. I had presumed this fact is what had led to your confusion. If the chirality center is not the reactive center, what would you predict the result to be? In the example I gave bromination would occur adjacent to the bromine. What would you get in my example?