00:02
Hi there.
00:03
In this question, we want to know which of the compounds named there is going to have all four, a primary, secondary, tertiary, and quaternary carbon atom.
00:13
Let's talk about what each of these are.
00:15
A primary carbon atom refers to a carbon atom that is only bonded to one other carbon chain.
00:26
That carbon chain can be as, as small as one carbon or as many as an infinite number of carbons.
00:34
But the point being, the carbon of interest is only bonded to one other carbon.
00:38
The other three bonds are to hydrogen.
00:42
A secondary carbon is bonded to two other carbon chains.
00:51
So now we've added an r prime.
00:53
R and r prime could be the same, or they could be different length carbon chains.
00:58
But we still have two bonds to hydrogens.
01:01
In a tertiary, now three of the bonds to the original carbon are carbons, with the fourth one being a hydrogen.
01:11
This is tertiary.
01:16
And finally, for quaternary, as you might have guessed by now, means it's the carbon that we're interested in is bonded to four other carbons and no hydrogens.
01:29
So that's quaternary.
01:35
All righty.
01:36
So let's look at our choices here.
01:40
And i'm just going to be drawing in the carbons here.
01:43
Our first option is pentane.
01:47
So just normal pentane.
01:51
Normal pentane looks like it has.
01:56
Primary and secondary carbons.
01:59
So primary, i'm going to use red for those.
02:04
This is a primary carbon, for example.
02:06
So with one on the other end be.
02:09
And secondary carbons, well, any of these ones in the middle that are bonded to two other carbons.
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Remember, the other two bonds are going off to hydrogens.
02:18
So they are not carbon atoms.
02:21
All right, this only has primary and secondary.
02:23
So it's not going to be pentane.
02:28
Let's get our next molecule...