00:01
In this problem, we're given an alcohol, and we're given four different options of hydrogens, and we're asked in proton nmr, which would be most upfield.
00:12
So our proton nmr, near to zero, so near your standard, this is what we consider upfield, and the further you go down, that's downfield.
00:29
And when things are upfield, it means they're shielded.
00:38
And to explain this, when things are deshielded and downfield, it means electron density is pulled away from them, so they're more exposed.
00:48
So when you have an electron negative atom that pulls electron density towards it, it des shields these hydrogens...