00:01
And this problem, we need to rank all of these ions and neutral species in terms of which ones are the best leaving groups.
00:08
So in a, we are given oh minus, f minus, and h2 minus.
00:13
So we need to compare the, there are all of these ions, conjugate acids, pqas.
00:20
So oh minus is conjugate acid is water and it has a pca of around 15.
00:26
F minus is conjugate acid is hf and it has a pca of around 3.
00:31
H2 minus conjugate acid is an h3.
00:35
It has a pca of around 38.
00:38
So the best leaving group is going to be the conjugate acid is the lowest pga.
00:44
So our best leaving group is going to be f minus.
00:49
Our middle leaving group is going to be oh minus.
00:55
And our worst leaving group of these is going to be nh2 minus.
01:02
Nb we're given water nh2 minus and oh minus.
01:07
So just looking at these, you can tell the h2o is going to be the best leaving group.
01:15
And that's because if something can leave and be uncharged, it's going to do that.
01:20
So anything that ends up uncharged when it leaves is going to be better than a charged species...