00:02
Hi there, in this question we are trying to identify functional groups in these molecules.
00:09
And functional groups can be identified by patterns.
00:16
So molecules that have the same pattern can be grouped together in different functional groups.
00:25
And when we're trying to identify a functional group, any hydrocarbon chain is given the letter r, or if there's more than one we'll have r and r prime, etc.
00:43
So let's look at our first one here.
00:46
We see that we have a ch3, so that's an r group.
00:51
That is then bonded to a carbon, which is double bonded to an oxygen, single bonded to an oxygen, and that oxygen is bonded to another hydrocarbon group of two carbons and five hydrogens.
01:04
So we'll call that an r prime.
01:07
So by replacing those hydrocarbon groups with r's, now we can match this up with the patterns that you should have for your different functional groups.
01:16
When we see this pattern here, we know that this belongs to an ester.
01:24
It would not be a carboxylic acid because carboxylic acids would not have a hydrocarbon group here...