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Solution: Ramelteon is a hypnotic agent used in the treatment of insom...

Question

Ramelteon is a hypnotic agent used in the treatment of insomnia: 

  1. (g)  Identify the geometry of each atom (except for hydrogen atoms). 

Video Transcript

Alright guys. So, for this question we're going to be looking at the molecular geometry, so hopefully you guys have the rules memorized on how we determine, here we go how we determine the geometry for all of our molecules. Now, we can break them up into sp3, sp2 and we're not going to have any SP hybridized here, so we're just going to leave it up those two, remember for SP2 it could be bent, right? It could also be trigonal planar and for sp3 it could be tetrahedral, it could also be tri, that was weird spelling, right? Trigonal pyramidal, so notice the difference and the last one you guys know what it is? it's bent and this has to do with, you know, sp2 is bonded to three things, sp3 is bonded to four then we can break this up where this category has to do with one lone pair and this one has to do with two, okay? So, keep that in mind that was just a quick review. Notice that if we have an sp3 hybridized carbon and I want to label those as all of these there should be a total of seven. So, 1, 2, 3, 4, 5, 6, 7 or excuse me, total of nine, all those nine carbons right there and red they're all at 3 hybridized, they don't have any lone pair, they're just attached to four things, so what do you think we would call those, what would we label their geometry as? there is tetrahedral, okay? So let's go to the next one, what about the ones that are sp?2 they're attached to three things and by those I'm talking about these carbons. Now, there should be a total of seven, all these carbons right here they're attached to three other things, okay? So there's a total of seven there, if you count them up there's six in this ring and one over here, so these seven are going to fall in the category of sp2 with no lone pairs. So, trigonal planar and remember we're not taking a look at our hydrogens but we still have some other ones to consider. Notice we have our oxygen, this nitrogen and this oxygen. Now, let's start with this oxygen over here, I'm going to do this one in green, this one over here is going to have two lone pairs, it's connected to two things, so what's that going to be, it's going to be bent. Now, let's take a look at the other oxygen is connected to two things, wait a second guys, we can include the lone pairs but it's only connected to one other thing, so this is not going to be relevant, we're not going to talk about the geometry for this one, okay? we're going to say it has no geometry, okay? we're going to say it's, I'm just going to say not relevant because it's only connected to one other atom, right? Where the other ones that connected to two atoms, this is only connected to one. Now, let's talk about finally this nitrogen over here, so what do you think about this one? Well, it's connected to three things and it has a lone pair, okay? So, three things, one lone pair we're going to call this one trigonal pyramidal. Alright guys, so hopefully this makes sense, we're just using these rules that we have right to memorize how do we know what the geometry is for all of our atoms. Alright guys, so hopefully this makes sense,

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