Question
Note to players: Pencil and paper may be helpful. The two most common applications of this technique rely on the relative positioning of carbon-13 atoms or protons. For 10 points each:
[10e] Name this technique that identifies molecules based on the chemical shifts of their component atoms upon application of a strong magnetic field.
ANSWER: NMR spectroscopy [or nuclear magnetic resonance spectroscopy; prompt on magnetic resonance imaging or MRI]
[10m] The two most common solvents for proton NMR are heavy water and the deuterated form of this molecule, which normally appears as a peak at 7.26 parts-per-million if not fully suppressed.
ANSWER: chloroform [or CHCl3; accept deuterated chloroform or CDCl3]
[10h] Note to moderator: Read this part slowly. Consider the proton NMR readout of 1-propanol. What is the splitting pattern for the hydrogens on the carbon between the terminal carbon and the carbon bound to the hydroxyl group? Your answer should be a combination of singlets, doublets, triplets, and/or quartets. You have 10 seconds.
ANSWER: triplet of quartets [or quartet of triplets; reject partial answers]
<Chemistry>
Summary
| 2024 ACF Regionals @ Berkeley | 01/27/2024 | Y | 3 | 13.33 | 100% | 33% | 0% |
| 2024 ACF Regionals @ Cornell | 01/27/2024 | Y | 3 | 10.00 | 67% | 33% | 0% |
| 2024 ACF Regionals @ JMU | 01/27/2024 | Y | 11 | 9.09 | 46% | 36% | 9% |
| 2024 ACF Regionals @ Minnesota | 01/27/2024 | Y | 2 | 10.00 | 100% | 0% | 0% |
| 2024 ACF Regionals @ Nebraska | 01/27/2024 | Y | 6 | 11.67 | 67% | 50% | 0% |
| 2024 ACF Regionals @ Ohio State | 01/27/2024 | Y | 3 | 20.00 | 100% | 100% | 0% |
| 2024 ACF Regionals @ Rutgers | 01/27/2024 | Y | 5 | 20.00 | 100% | 60% | 40% |
| 2024 ACF Regionals @ Imperial | 01/27/2024 | Y | 4 | 12.50 | 75% | 25% | 25% |
| 2024 ACF Regionals @ Vanderbilt | 01/27/2024 | Y | 5 | 14.00 | 100% | 40% | 0% |
Data
| Claremont A | Iowa A | 10 | 10 | 0 | 20 |
| UBC A | Michigan State A | 10 | 10 | 0 | 20 |
| Texas A | Rice A | 10 | 0 | 0 | 10 |
| Sorbonne | Iowa B | 0 | 10 | 0 | 10 |
| Texas A&M A | UW A | 10 | 0 | 0 | 10 |
| Appalachian State | Texas A&M B | 0 | 0 | 0 | 0 |