00:01
Okay, so this question asks us to arrange the following compounds in order of increasing melting point.
00:08
So the melting point is strongly related to the interaction between the molecules.
00:15
The stronger the interaction, the higher the melting point.
00:19
So this question actually converts to comparing the interactions between the molecules.
00:26
So let's look at the molecules.
00:29
First glance, we say it has a nitrogen in this graph, and this one has oxygen, and these two are just purely carbon.
00:41
So for the first side, we find how the first thing we need to do is to determine the interactions existing in those molecules.
00:54
So for this one, you'll find it has nitrogen and carbon, so they are different atoms.
01:03
And if we look at them, you'll find actually there will be some dipo -dipo interactions.
01:17
I will just use dd interactions to represent.
01:22
And for b, it also has a v -vand -vards interaction...