 Okay, let's try this one again. Rank the following in order of increasing the activity. So the fastest one is going to be number 4. Okay, this one's ranking leading groups in an SM1 reaction. So which would give you the fastest SM1 reaction? The biggest one. The biggest one is going to give you. The biggest one, okay? Why the biggest one? Not chlorine. That's iodine, right? So iodine is going to be 4 or 3 in this case. Roaming is going to be 2 and chlorine is going to be 1. Why? Well it is bigger but not because it's going to make the reaction more polar. Anybody remember what we said? What was that? Polarizability. Kind of, I guess you could think of the bond as more polarizable. But it's really, if you recall what we said was bigger atoms can carry a negative charge or any charge better than a smaller atom. Because the charge here and here is equivalent, right? Does everybody agree with that? So that's like carrying a weight, okay? So iodine is like a very big atom, okay? And it's got that negative 1 weight, okay? Chlorine is a very small atom. It's got that same weight, right? So both atoms are trying to disperse that negative charge around their surface area. So whichever one has the biggest surface area can distribute that charge to more parts of its surface area and kind of distribute that weight, if we will, right? That weight that we were talking about along more of its surface area and make it less charge dense in any one area, okay? So it can break up that charge more. Is there any questions about this one? Okay, we'll kill it.