Subject: What different effects do different compounds with the same elements have?

This question has been bugging me for a long time and I can't get it out of my 
head.
If you have a compound, which keeps in check, the same ratio of two elements, 
does it still behave the same? example: does CO have the same effect as C2O2?
Most compounds have definite ends such as: O=C=O which ends at the two Oxygen 
atoms.
What happens in a molecule like C20H20, if every Carbon atom has a bond with 
three carbon atoms, and a hydrogen? When I modelled it with an atom kit, it 
came out like a ball with no end, like the Earth. What effect would this have 
on the compound, if any? Would it still be combustible? 
Is it even POSSIBLE to engineer a molecule like this, and if not, what would 
happen if you tried? Would a C20O20 molecule 
have the same properties as carbon monoxide if the Oxygen didn't bond to the 
other oxygens if it's in the same configuration as the "hydrogen ball"? WHY is 
carbon monoxide toxic?
--Your learning friend, Steven (yet again)

Re: What different effects do different compounds with the same elements have?