H NMR (1 Viewer)

[=)(=]

Im not sure why the answer is A isn't there a hydrogen bonded to a Nitrogen so by n=1 rule shouldn't there be 2 splits?

 

[HSCya1234567]

The H 's bonded to Ns or OH groups do not cause splitting I believe

 

[wizzkids]

The H 's bonded to Ns or OH groups do not cause splitting I believe

That is correct. This is a very difficult question to give to high school Chemistry students. It is bad enough that we have to learn about spin-spin coupling to reveal the fine scale structure in proton-NMR spectra. But then to ask students to remember the exceptions to the rule is really cruel, in my opinion. The absence of spin-spin coupling is particularly relevant to primary alcohols; the hydrogen in the hydroxyl OH group does not count as a neighbour for predicting peak-splitting. The spin-spin coupling between adjacent hydrogens normally does not cross over another functional group.

 

[=)(=]

ohh okay ty

 

[=)(=]

wait also for this which is 13C NMR is it for the carbon bonded to a carbonyl group?

 

[synthesisFR]

View attachment 39408
Im not sure why the answer is A isn't there a hydrogen bonded to a Nitrogen so by n=1 rule shouldn't there be 2 splits?

when i was taught it i was told u always look at the neighbouring carbon atoms and the hydrogens that they have not other molecules.

 

[synthesisFR]

and how much do u study like damn ur always doing past papers. ive barely started ...

 

[nsw..wollongong]

and how much do u study like damn ur always doing past papers. ive barely started ...

BS

 

[=)(=]

and how much do u study like damn ur always doing past papers. ive barely started ...

hhahahaha not that much tbh i've been slacking off a tad since trials