Hey everyone. So, here in this example question it says, arrange the following monomers from highest to lowest reactivity towards cationic polymerization. Remember, we said that electron donating groups help to promote cationic polymerization. So if we take a look here, here are our alkenes, and we just have to see what's attached to them. Here, we have an electron donating group and benzene also acts as an electron donating group.

Here, we have 2. We're I'll put them as blue. These are electron withdrawing groups, the nitrile and the carbonyl. This oxygen has lone pairs. It is not as electron donating as in one because the carbonyl does siphon off some of this energy.

Alright? And then finally, we have here another carbonyl. So this is another electron withdrawing group. So we wanna go from highest to lowest reactivity. 1 would be the highest because one has electron donating groups, pretty good ones.

Followed by 3 because although oxygen here is not as good at electron donating, it's still 1. And then 4 would be next because we only have 1 electron withdrawing group. And then finally, 2 would be the slowest because it's connected to 2 electron withdrawing groups in the form of Nitrile and the carbonyl group. Right? So again, remember, we say that electron donating groups attached to our alkene carbons help to foster or promote cationic polymerization.