So what is the proper resonance structure to draw? Well, let's show that down here. This is not a correct resonance structure. So we added another formal charge, and we have carbon with five bonds, so this is incorrect, If we go to this top carbon here, there's only three bondsĪround that carbon, so that carbon would haveĪ plus one formal charge. There's another reason why this is wrong. In the second period, there's four orbitals, and each orbital can hold a maximum of two electrons, which gives us four times Because of carbon's position on the periodic table, You can't show carbon with five bonds, because that would be 10 electrons around this carbon, and carbon can never exceedĪn octet of electrons. How many bonds are there to that carbon? Well here's one bond, two, three, four, and five, that's five bonds to a carbon, that does not happen, Let's focus in on this carbon right here, the one I marked in red. Why this resonance structure is incorrect. So let's put in those hydrogens for the resonance structure on the right, and it should be obvious Plus one formal charge must have one hydrogen. Has two hydrogens on it, and the carbon with a Has one hydrogen on it, same with this carbon, and this carbon right here Structure not possible? Well, let's draw in the hydrogens on the carbons, and it So the resonance structure on the right, this is an incorrect resonance structure, why is this resonance But this is incorrect, so let me write "no" here. Let me highlight thoseĮlectrons in blue here, so these electrons here move down to here. Some students would take these electrons and move them down to here and say, all right, so on the right, now, I would have this, and this is my resonance structure. So let's say we wanted to draw a resonance structureįor this carbocation. I see a lot of mistakes when students draw resonance structures, and so I wanted to make a video on some of the more common
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |