00:01
Here the question is to predict the nmr pattern of isopropropile group.
00:06
The structure of isopropile group can be drawn as.
00:13
So this is the isopropile group.
00:15
In nmr, identical hydrogen gives single signal.
00:20
Here if we look at this group, this hydrogen and this hydrogens are similar and these six hydrogen will give only one signal.
00:30
And this is a different hydrogen and it will give another.
00:33
The signal.
00:35
So, overall there will be two signals this way.
00:41
Now, in this side we have chemical shift delta and it is marked from zero towards here, that is towards this side, the delta value increases.
00:53
Now this delta value is decided by the environment of atom around.
00:59
For example, this is a particular hydrogen and its environment is, there is a medial group, medial group, and this medial group are electron rich or electron donating group so there will be more electron cloud around this hydrogen atom so if there is more electron cloud around this hydrogen atom means it is more shielded from the magnetic field the nucleus of this hydrogen will be more shielded from the magnetic field and the magnetic field experienced by this nucleus the nucleus of this hydrogen atom will be less.
01:32
So the delta value of this hydrogen atom will also be less.
01:38
So we can say the delta value is less when the electron cloud around that atom is higher.
01:47
So compared to the terminal hydrogen, the electron cloud around this hydrogen is higher and the delta value will be lower.
01:54
So this signal is for the red colored hydrogen and this signal is for the orange colored hydrogen.
02:01
Now in the presence of other hydrogen atom there will be splitting and the splitting happens according to the equation 2n i plus 1 where n is the number of hydrogen...