Packet 9: Bonus 16

Hindered inversion of this quantity drives a form of conformational isomerism called akampt·isomerism, which uses this quantity to distinguish “parvo-” and “amplo-” isomers. For 10 points each:
[10m] Name this quantity plotted against molecular orbital binding energy on a Walsh diagram. This quantity changes in rocking and scissoring vibrational modes, but not stretching or twisting modes.
ANSWER: bond angle [prompt on angle]
[10h] Akampt·isomerism was first described by Canfield et al. in boron–oxygen–boron bridges between two of these molecules. A bulky “picket-fence” one of these molecules controls ligand binding via steric hindrance.
ANSWER: porphyrins [accept picket-fence porphyrins]
[10e] Akampt·isomerism is generally visible in macrocyclic systems with a central atom displaying this geometry. In VSEPR theory, water takes on this molecular geometry due to its two lone pairs.
ANSWER: bent [accept angular or V-shaped]
<Editors, Chemistry> | R. Playoffs 9 (Editors 9)

HeardPPBE %M %H %
2316.52100%61%4%

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Conversion

TeamOpponentPart 1Part 2Part 3TotalParts
BrownIllinois B1001020ME
BruinVirginia001010E
CambridgeToronto B1001020ME
Chicago BNorth Carolina1001020ME
Columbia AChicago A001010E
Columbia BOhio State1001020ME
GeorgetownUCF001010E
Illinois AGeorgia Tech C10101030MHE
IndianaHarvard1001020ME
MITTexas1001020ME
Maryland AVirginia Tech1001020ME
MichiganJohns Hopkins001010E
NYU ANorthwestern A001010E
Penn StateNYU B1001020ME
PittsburghUCLA1001020ME
PurdueCornell001010E
RutgersGeorgia Tech A1001020ME
Stanford AUC Berkeley A1001020ME
Stanford BGeorgia Tech B001010E
UC Berkeley BToronto A1001020ME
VanderbiltMinnesota001010E
WashUBritish Columbia1001020ME
WaterlooSwarthmore001010E

Summary

TournamentEditionMatchHeardPPBE %M %H %
Main Site2026-04-17✓2316.52100%61%4%