Let it be organic or inorganic compound 
More the no. of bonds between 2 atoms more the energy required to break it.

This is because intermolecular force of attraction increases as the no. of bonds increase. So to break the bonds one needs more energy or so called more bond enthalpy.

Energy required to break single bond vs double bond vs triple bond of a carbon atom in an organic molecule
So BB was born with the Shinigami eyes because a Shinigami dropped it's eyeballs. But how is this even possible? Did the Shinigami ripped out his eyes and then let them fall down to Earth? I just don't get it. 

Also, if a human touched the eyes of a Shinigami, would he then also get Shinigami eyes?
