Question

What's happening in this reaction? I'm having a hard time understanding this.
"The black spheres are carbon atoms, the white spheres are hydrogen atoms, the red spheres are oxygen atoms, and the blue dots are bromine atoms."

1. I'm also supposed to draw the steps of the reaction in the correct order?
2. Draw an energy diagram of the reaction in which you label the energies of each step in the reaction and the activation energy.