Product name for 3,5-dimethyl hexan-6-oic acid

The answer for #3 is c but i don't know why

What will most likely happen when two bromine atoms bond together?

How does the value of the equilibrium constant show that a reaction reaches equilibrium very quickly? (a) the equilibrium constant is large. (b) the equilibrium constant is small. (c) the equilibrium constant is zero. (d) the value of the equilibrium constant does not show how quickly a reaction comes to equilibrium.