00:02
So this problem, again, asks us to find the chiral center, and it also asks us to order the priorities of the molecules that are surrounding the carbon.
00:12
So the first step is to find the chiral center.
00:15
So we know that a chiral center is a carbon molecule that is surrounded by four different types of molecules.
00:21
So let's evaluate all of the carbons that are present in this molecule and see which one qualifies as the chiral center.
00:28
So the first carbon that i see is this carbon right here.
00:31
And it's surrounded by three methyl groups.
00:34
It has a ch3 over here, a ch3 over here, and the ch3 over here.
00:39
So immediately we can evaluate this as not being the chiro center because it's surrounded by three of the same exact molecules.
00:46
Sorry, i'm interested in ch3.
00:48
Now, the next carbon that we can look at is one of the carbons that is the methyl group.
00:56
So let me just open up one of these carbons.
01:01
Let's look at this carbon.
01:02
Now, this carbon has a hydrogen, a hydrogen, and a hydrogen surrounding it.
01:09
So this carbon definitely cannot be a chirocentry because it has three of the same molecules surrounding it.
01:14
The next carbon we're going to look at is this carbon.
01:17
Now, this carbon has this carbon surrounding it here and this carbon surrounding it here, which are both different, but it also has two hydrogens over here because we know that a carbon is surrounded by four molecules.
01:28
So the only other molecules that are that could be present here are two hydrogens because hydrogens are often not written.
01:37
They're just assumed to be there.
01:39
So now the next carbon we can look at is this carbon.
01:42
Now this carbon is part of, it's a special type of carbon because it's part of a double bond.
01:47
Now, we know that a carbon that is part of a double bond can never be a cairo center because a carbon that is part of a double bond is technically we need to look at it as it is bound to two hundred.
01:58
Carbon molecules.
02:00
So since it's bound to two carbon molecules, it cannot be the chiro center.
02:04
Now, the next carbon we're going to look at, again, so the next carbon we're going to look at, so this carbon definitely cannot be the chiro center either because it has the same problem.
02:15
It's surrounded.
02:16
It's in a double bond with this carbon.
02:19
So the next carbon we're going to look at is say this carbon.
02:22
Now this carbon is a methyl, and again, we already have decided that methyl groups cannot be chiral centers because they're surrounded by three hydrogens.
02:30
And this carbon is surrounded by two hydrogens because we know that it has this carbon attached on this side and this carbon attached on this side.
02:40
So it cannot be the carol center either.
02:42
So we're pretty much only left with this carbon molecule.
02:46
Now this carbon molecule, it looks like can be the chiral center because it's surrounded by this on this side, these carbons on this side, which are very different from these carbons on this side, which are very different from this carbon on this side and this carbon on this side.
03:00
So this carbon, i think, we can assume, is the chiro center.
03:05
So i'm going to put a star and label it as the chiro center.
03:12
So that helps us with the first part of the question.
03:15
Now, the second part of the question asks us to prioritize the molecules that are surrounding the carbon.
03:23
So now, let us look at the first carbon that is surrounding this carbon right here.
03:29
So the first one is this carbon right over here.
03:32
Now this carbon has an oxygen next to it.
03:36
And immediately, when we think of our oxygen, we should say, okay, oxygens have extreme priority because oxygens are, um, oxygens have extreme priority because they have a greater mass than carbon.
03:48
Carbon has a mass of around 12...