What would a bohr diagram look like for oxygen?

Under normal circumstances, it's an "S" shape.  The graph below shows both a normal Bhor diagram and one during exercise or what otherwise would cause a high release of Carbon dioxide. Oxygen dissociates much more readily and easily if the concentration of CO2 is higher. 

Alkanes, being saturated hydrocarbon compounds do not appear in the periodic table because periodic table consists only of elements arranged in periods and rows according to their atomic number, electronic configuration and valency.