00:01
So we want to rank the following sets of substituents.
00:05
So let's go ahead and start with this first set here.
00:09
So for this one, i don't think we actually need to draw anything out.
00:11
But remember, the thing we're going to want to compare is atomic number.
00:17
So first, between a hydrogen and oxygen, a carbon, and a carbon.
00:22
Hydrogen is going to have the lowest priority.
00:26
So we can already go ahead and just put h at the very bottom of our stack.
00:31
Then, between carbon and oxygen, well, carbon has an atomic number of six, while oxygen has an atomic number of eight, so then we're going to have to compare these to alcohol groups.
00:52
So let's actually draw those out.
00:55
So this one is going to be carbon, and it's attached to, or we have our r group attached to the carbon.
01:03
It has two hydrogens, and then it has a carbon attached with three hydrogens.
01:11
And then our next one, so it has this carbon, has two hydrogens, and then the carbon comes out.
01:21
And then this one has two hydrogens, and then an alcohol attached.
01:26
So when we start at this first carbon here, while those have the same priority, they have two hydrogens attached to it.
01:32
So then we're going to have to go down the chain a little bit.
01:35
And then again, we have two carbons, no issues there.
01:38
These hydrogens will knock all out.
01:43
And then we have to compare this oxygen to this hydrogen.
01:47
Well, the oxygen has higher priority.
01:50
And so because of that, our just pure ethyl group would be second.
01:57
So we're going to have the ch.
02:00
And let me actually put the little dashes here.
02:03
So ch2, ch3.
02:06
And then we have our ethanol group.
02:14
And then lastly, we'll just have our alcohol.
02:17
So one thing that is important is that we always compare kind of like what we did here.
02:22
We just compare each of them as they're attached and we go down the line.
02:26
It doesn't matter what we have further down the line.
02:30
It's always piece by piece first.
02:33
So that's going to be for a.
02:34
Now let's move on to b here.
02:39
We have a carbon versus a carbon, a carbon, then in alcohol.
02:43
So between all of these, the alcohol is going to have higher priority.
02:47
So this is going to be our last one.
02:49
So let's just put that on the end here.
02:51
And now we just need to decide how do we order these three with the carbons.
02:55
Let's go ahead and draw them all out.
02:57
So that first one is going to be in r group.
03:00
And then it has...
03:01
So anytime you see like o2h, that should be a carboxylk acid.
03:07
And then this next one, so when you have like o2 and then ch3, that's a ester, so it looks something kind of like that.
03:20
And then lastly, this would just be in our group, two hydrogens, and then we have our alcohol attached like that.
03:32
Actually, let me go ahead and put these hydrogens on the end here.
03:36
So let's compare.
03:38
So we start all of them out on a.....