QR & Orgo Opinions

[AbergermRDH]

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I was wondering if you all thought it truly necessary to memorize the exact values for CNMR and HNMR spectrums? I have the IR values memorized, but all sample questions I have utilized (DAT Bootcamp & Crack the DAT, Kaplan Book) have been asking simply how many signals would show up on a CNMR spectrum for this molecule... ect. same for H signals.

I just want to know if anyone has ever seen anything other than this type of problem. Not that I don't understand it is entirely plausible.

Also, I am wondering about the weight of trig in the QR section, my gut tells me this may take up a large portion of it. Any suggestions just to calm my nerves, I have always hated trig and memorizing the identities and am very worried about only this portion of the QR section!! Was there more trig than anything else on your tests??

TIA Guys!

 

[plusalpha]

I was wondering if you all thought it truly necessary to memorize the exact values for CNMR and HNMR spectrums? I have the IR values memorized, but all sample questions I have utilized (DAT Bootcamp & Crack the DAT, Kaplan Book) have been asking simply how many signals would show up on a CNMR spectrum for this molecule... ect. same for H signals.

I just want to know if anyone has ever seen anything other than this type of problem. Not that I don't understand it is entirely plausible.

Also, I am wondering about the weight of trig in the QR section, my gut tells me this may take up a large portion of it. Any suggestions just to calm my nerves, I have always hated trig and memorizing the identities and am very worried about only this portion of the QR section!! Was there more trig than anything else on your tests??

TIA Guys!

No joke, I literally had 3 CNMR/HNMR questions on my actual DAT. For the CNMR questions, I think it's sufficient just to know how many signals a molecule will produce (how many "similar" environment carbons there are using the symmetry method). For HNMR questions, know the ballpark range of the ppm values of the common functional groups (carboxylic acid, aldehyde, carbonyl group, etc.), and here also know how many signals a molecule will produce. You may get absolutely none of the NMR questions, who knows, but I would recommend knowing the basics of NMR at least.

For your QR section question, I don't know if there were trig questions more than ANYTHING else on my exam, but I think I had at least a couple of trig questions. Yes, DO memorize the trig identities.

 

[AbergermRDH]

No joke, I literally had 3 CNMR/HNMR questions on my actual DAT. For the CNMR questions, I think it's sufficient just to know how many signals a molecule will produce (how many "similar" environment carbons there are using the symmetry method). For HNMR questions, know the ballpark range of the ppm values of the common functional groups (carboxylic acid, aldehyde, carbonyl group, etc.), and here also know how many signals a molecule will produce. You may get absolutely none of the NMR questions, who knows, but I would recommend knowing the basics of NMR at least.

For your QR section question, I don't know if there were trig questions more than ANYTHING else on my exam, but I think I had at least a couple of trig questions. Yes, DO memorize the trig identities.

Thanks! I figured as much with signals, so I will add memorizing the HNMR ppm values to my list just to be safe. Trig is the bane of my existence but I figured the trig identities were an absolute must regardless! Thanks so much! 🙂