Hello! I have silly question on resonance, it's so silly, I couldn't find an answer: Lets say there is a O=CR-CH=CH2 bonding in a molecule, R = some other group. You can get (I have put the charges in brackets and Superposition (I think thats what its called): (1-)O-C=C-C(1+) (ignoring hydrogens for simplicity) But why not (1+)O-C=C-C(1-)? Why not the carbanion, and the oxygen with the positive charge? And if the 2 electrons from the pi-bond can transfer on to the oxygenm, why not nay of the other carbons, e.g. (1+)O-C(1-)-C=C and O=C-C(1-)-C(1+)? Does that make sense? Is it because they are just so unfavourable they are not worth including? Any help appreciated! Thankyou!