 Let's do this one. It says, which one of these following molecules has the highest boiling form? So these are written in a way that's not the most conducive to figure this out. So I'm going to change them to bond line form. Okay, so I would prefer to look at things in bond line form. That way you can see the actual lone pairs and you can see the hydrogens that are actually connected to the electronegative atoms. Because this question is asking really about hydrogen bonding. Okay, so let's go ahead and draw those. So this one, hopefully you can tell it's propane, so this looks like that. This is an ether here, so methyl propyl ether, it's like that. And we're going to put the lone pairs because like I said, we're going to be interested in this. Okay, so this one here, this is a ketone, methyl ethyl ketone. So let's draw that. Again, I'm going to put my lone pairs because they're interesting in this particular problem. And then this one, this is just propanol. Again, I'm going to actually really show the oxygen-hydrogen bond there and show the lone pairs that are on that oxygen. So is everybody okay to translate these structures into the bond line structures? So I'm going to erase the things that were given in the problem. So now we see these structures for what they are. And we can tell, well, where is the hydrogen bond donors and acceptors going to be? So remember, to be a hydrogen bond acceptor, you have to have a lone pair. So it has to be an atom with a lone pair. So does this have any atoms with a lone pair? No, does this one? Yeah, how many lone pairs does it have? Two, right? So it's got two hydrogen bond acceptors, okay? I'm going to draw my acceptors there. So the two hydrogen bond acceptors. Here, does it have any hydrogen bond acceptors? How many? Two, right? We'll draw them. And what about this one? Two as well, right? Okay, but remember, hydrogens that are attached are bonded to electronegative atoms, are hydrogen bond donors as well, okay? So if we look, does this thing have any hydrogen specifically that are bonded to electronegative atoms? No, does this one? No, does this one? No, does this one? Yes, okay. So we actually got a hydrogen bond donor there, okay? So what you find is when you've got both the donors and the acceptors, that's going to raise your boiling point significantly. So the question asked us, which one of these would we expect to have the highest boiling point? I would say it's definitely propanol, because it's got the two acceptors, which everything else does, but plus the dome, okay? So you might ask, well, if I look here, this one here, methylpropyl ether, is higher in molecular weight, but the hydrogen bonding trumps molecular weight in this particular example, okay? Are there any questions about that? Sure, no questions.