00:01
So we are given the following structures here, and we want to find out which of the following structures are identical to each other.
00:08
So one thing to note here is that they all have the same molecular formula, and therefore one way that we can tell whether they are identical or not is assignment configuration.
00:19
And if they have the same absolute configuration, then they are going to be the same, they're going to be identical.
00:26
So looking at structure a here, we can go ahead and assign priority.
00:32
We know that chlorine, when we assign priority, our highest priority is going to be our highest mass group, and that is going to be our chlorine here.
00:42
And then looking at our second highest priority, that is going to be our carbonicilic acid because it's going to be, it's going to share three bonds to an oxygen, whereas our ch3 group, which we will call priority number three, shares three bonds to hydrogen.
00:57
And then for our least priority, it's going to be our hydrogen here since it's our lowest mass atom.
01:05
And looking at our way we are going, the direction we are going here, going from 1 to 2 to 3 to 4, it looks like we are going clockwise.
01:16
And this is good because we have our hydrogen going away from us, which is exactly what we want.
01:21
And so we would designate this as the arc configuration for structure a.
01:26
For structure b, we can do the same priority assignment.
01:30
So chlorine is going to be 1, the carbacylgazate 2, the methyl 3, and the hydrogen 4.
01:38
So here we go.
01:39
It looks like we are going counterclockwise.
01:41
So here we would say s.
01:43
However, we have to remember that this is actually going to be r...