 You know each other, like you swing first, not you swing first. Yeah. Anyway. This is something the kids are doing when they're not doing it. Let's do this problem. We're video recording right now, so should we record this one first? OK. So this problem asks us, predict whether the following carbocation will rearrange. If so, do I draw the curve error mechanism for the reaction? OK, so will this carbocation rearrange? Yes, it will. OK, so how do we identify whether a carbocation will rearrange or not? So what carbocations do we know will not rearrange? Tertiary. Tertiary. OK, so this one is a secondary, right? So we should be already looking to see if it will rearrange to a tertiary. OK, so we can imagine if we can get it to there somehow, it could rearrange to be a tertiary. OK, so remember, rearrangements, these rearrangements happen in a 1, 2 fashion. OK, so the carbocation is 1, and a carbon alpha to that carbocation would be 2, so 1 carbon away. So we could move it from there or we could move it from there. If we move a hydrogen from there to there, we would get a positive charge there. That's a secondary carbocation. It's not going to go from a secondary to a secondary. That's not given more stability, so no reaction all over. But we could move one of these two methyl groups. OK, if we do that, let's just see what happens. So take the methyl group and move it to carbon 1 there. So now this is a 1, 2 methyl shift. So when we do that, where does the plus charge end up? Yep, on the top carbon there. So what type of carbocation do we have here? Tertiary. Tertiary. So is that more stable than a secondary? So that will happen. So will it shift? Yeah. Yes. So we just shift them like a bond. Just taking a group and moving into the other thing. So it's a 1, 2 methyl shift. So you're moving the methyl group. So if you wanted to do a 1, 2 hydride shift, you've got to move the hydrogen with its electrons. You're moving the methyl with its electrons. So what is tertiary on that one, the carbon? The carbocation ion. It's all your arms around it. The carbocation ion. It's got three carbons around it. This carbocation ion has one, two carbons around it. So it's second. Oh, you count. It's the carbons around it. They're all the same. Uh-huh. Yeah. That's not hydrogen. And from the bottom to the start, it's going to be like, hey, they have a positive turn. OK. Any other questions? OK.