 OK, so let's try this one. It says, supply the missing components and show the reaction mechanism of these steps of the reaction. So what kind of reaction is happening in the first reaction do you guys think? You want to say, are you a substitution reaction? What kind of substitution reaction, like what number? Is it an SM2 or SM1? It could be an SM1 reaction. What would be the, if it was an SM1 reaction, what would the, what would be over the ReA genera? Might be easier for you guys if you thought about it as an SM2 reaction. What would it be if it was an SM2 reaction? What would be right there? How do we do the last one? Yeah, so what? Well, sodium and then what? Na, what would the rest be? S-H. And then, will we have to put something down here? What would we put? DMF. DMF, why would we put that? Solve it. What kind of solver? Polar. Protein. Polar A-protein solvent, OK? Those are the types of solvents we need for SN2 reaction. So, what about this step? What's happening? It's being deprotonated. Being deprotonated. So what do we need to have here? A hyodorant base. A base, yeah. So a good base would be what? Sodium hydroxide. Sodium hydroxide. Would that deprotonate like that? Yeah. OK, so should we go over the mechanism of this now? OK, so this step, right, what are we going to get when we put this into DMF? I get it? The sodium is going to be a spectator ion. And then the Cl, the chlorine would be a leaving group. Very good. And then we have the same thing, replacing substance. So this is your nucleophile, electrophile. We're going to have the SN2 reaction occur, like that. So when we do that, we get this plus what? The leaving, right? And then when we react NaOH with this acid here, what happens? It would deprotonate it. Remember the same thing, any spectator ion deprotonation like that? H2O. So notice, in these reaction sequences, oftentimes they only show the organic product, OK? So don't think that, just because they don't show the inorganic, that it's not showing you everything. Any questions about this one?