Carbon NMR of propan-2-ol

Hi Guys, how many different chemical environments are there in propan-2-ol? I believe there's 2- the CH3 groups and the COOH group but the answers say 3 and I can't seem to work out where the 3rd group is or what it even is lool.

Any help would be much appreciated.

Thanks in advance.

propanol doesn't have a COOH, it's an alcohol

A COOH functional group is for carboxylic acids. A carbon NMR of propan-2-ol has two environments, however there are three hydrogen environments.

Apologies for the mistake, I meant to say -CHOH-, so for carbon NMR it would have two peaks right?

Right, assuming this is an NMR question the answer is wrong. The OH proton is totally irrelevant as it will exchange with the D in the solvent and no peak will be observed.
So from a 'actual molecule' point of view there are 3 different proton environments (methyl, CH(Me)2OH and OH) but from an NMR point of view only 2.

Why wouldn't the OH peak show up? . Surely not every OH will have exchanged with solvent for the entire duration of the NMR sample being taken, so a singlet would show up..?

A quick database search shows there to be 3 peaks present

EDIT: This is for proton NMR

This exchange, which is catalyzed by acid or base, is very fast under normal conditions, since it is difficult to avoid traces of such catalysts in most experimental systems

Think about 2 things..... 1. NMR is very insensitive. You really don't get an idea for just how insensitive it is compared to e.g. mass spec
2. There are far more D's coming from the solvent than H's you put in from the sample. If they can equilibrate with each other then there will be a minute signal from the exchangeable protons.

That's all very well, but I have a 2-propanol spectrum in front of me and there's a clear peak from the alcoholic proton at 2.16ppm.

whats the solvent?

-OH protons in D₂O are replaced by D and they don't give a signal, in CDCl₃ they are not replaced, and they give a signal.

At least that's my understanding, last time I did any NMR was while Thatcher was a Prime Minister.

CDCl₃