Question

What molecule do you get from the following 1H-NMR/IR diagram?

Answer 1

@blues
@aaronq

Answer 2

Would be good if it was explained, as I need to master this very soon.

Answer 3

its hard for undergrads 2 master NMR. idk many who really "master" it at that lvl. but based on numbers given, 2260 if i rmr is an alkyne. asymmetric alkyne. ~1750 is C=O bond, but varies with groups.
for the H-NMR The area under the NMR resonance is proportional to the number of hydrogens which that resonance represents.
Do you know integration?

Answer 4

I would have that the 2266 should be a nitrile group.

Integration as in math or integration as in NMR? :P

Answer 5

Lol. NMR.

Answer 6

But yes I do :)

Answer 7

The integration tells us the relative number of protons that give rise to each signal

Answer 8

yes. u can get an approximation of the ratoi of hdrongesn

Answer 9

w/ the given formula, u can get an idea. that's how i would raltionalize it.

Answer 10

But becuase the approximation fits the number of protons we know there are then we just have to get the protons placed right. And I simple can't placed that nitrogen and one oxygen right.

Answer 11

That's how I did it. I was usually right. Lol. H-NMR was by far the toughest for me.

Answer 12

H-NMR, then C-NMR, and IR was easier of the three.

Answer 13

But what molecule would you get if you had to analyze this one?

Answer 14

I can't get all the functional groups placed with only 5 carbon.

Answer 15

couldn't really fit the carbonyl and the triple bond either..
and tried it without the alkyne n i couldn't fit the carbonyl with that few hydrogens..
so disregarding the IR i came up with this:


2 hydrogens being split by 3, quartet
3 hydrogens being split by 2, triplet
2 not split

Answer 16

What about this one?