Question
Binary compounds of these groups form binary acids when mixed with water. For 10 points each:
[10m] Name this group of polyatomic anions named for sharing properties with the typical leaving groups in cross-coupling reactions. Classic examples of these groups are cyanide and isocyanide.
ANSWER: pseudohalides [or pseudohalogens; reject “halogens” or “halides”]
[10h] All pseudohalides share the symbol X with the halides, but this simplest alkyl sulfonate gets its own pseudoelement symbol. Perfluorinating this group yields triflate.
ANSWER: mesyl [or Ms; accept mesylates]
[10e] Pseudo-rotations typically swap axial and equatorial atoms on molecules with this geometry, like phosphorus pentacyanide.
ANSWER: trigonal bipyramidal
<Chemistry>
Summary
| 2024 ACF Nationals | 2024-04-21 | Y | 18 | 11.67 | 78% | 39% | 0% |
Data
| Berkeley A | Brown | 10 | 0 | 10 | 20 |
| North Carolina A | Chicago A | 10 | 0 | 10 | 20 |
| North Carolina B | Chicago C | 10 | 0 | 10 | 20 |
| Rutgers | Claremont Colleges | 0 | 0 | 10 | 10 |
| Columbia A | WUSTL A | 10 | 0 | 10 | 20 |
| Ottawa | Columbia B | 0 | 0 | 0 | 0 |
| Georgia Tech | Michigan | 0 | 0 | 10 | 10 |
| Indiana | Stanford | 0 | 0 | 0 | 0 |
| Illinois | Johns Hopkins | 10 | 0 | 10 | 20 |
| Cornell B | Kentucky | 0 | 0 | 0 | 0 |
| Maryland | NYU | 0 | 0 | 10 | 10 |
| Harvard | McGill | 0 | 0 | 10 | 10 |
| Minnesota A | Cornell A | 10 | 0 | 10 | 20 |
| Chicago B | Purdue | 0 | 0 | 10 | 10 |
| Northwestern | Toronto A | 0 | 0 | 10 | 10 |
| Toronto B | Arizona State | 0 | 0 | 10 | 10 |
| Penn | Virginia | 0 | 0 | 0 | 0 |
| Texas | Waterloo | 10 | 0 | 10 | 20 |