Question
A measure of this property named for a “harmonic oscillator model of [it]” is proportional to the sum of the squared differences between a molecule’s bond lengths and certain reference values. For 10 points each:
[10e] Name this property that is also correlated with hardness. Molecules with this property produce a diamagnetic ring current in NMR spectroscopy.
ANSWER: aromaticity [accept word forms]
[10h] To calculate this measure of aromaticity developed by Schleyer et al., one places a ghost atom dubbed “Banquo” at the center of a ring, then calculates the effect on it of the magnetic field induced by the ring current.
ANSWER: nucleus-independent chemical shift [or NICS(0); prompt on chemical shift]
[10m] The NICS replaced this quantity’s “exaltation” as the most common NMR-derived quantification of aromaticity. A capillary filled with pure solvent is placed in an NMR tube in the Evans method for determining this quantity.
ANSWER: magnetic susceptibility
<Arya Karthik, Chemistry>
Summary
| 2023 Chicago Open | 08/05/2023 | Y | 1 | 30.00 | 100% | 100% | 100% |
Data
| The Catastrophic Implosion of Packet Sub | The Plague (anime)" was redirected to: "Oran High School Host Club | 10 | 10 | 10 | 30 |