pi bond - 2024 ACF Winter - Buzzpoints App

Question

Answer the following about the structure of the iron pentacarbonyl metal complex, for 10 points each.

[10e] The carbonyl ligands bond to the iron with an antibonding orbital via this interaction, termed its namesake “backbonding.” P-orbitals overlap laterally in this interaction, which is found with a sigma bond in double bonds.

ANSWER: pi bond [accept pi backbonding]

[10m] Iron pentacarbonyl exhibits a low but present rate of Berry pseudorotation due to having this coordination geometry. In VSEPR theory, molecules with this geometry have three equatorial and two axial substituents.

ANSWER: trigonal bipyramidal

[10h] Iron pentacarbonyl obeys this statement governing the stability of transition metal complexes. Coordinatively saturated complexes satisfy this statement, but d8 complexes like Zeise’s salt are common counterexamples.

ANSWER: 18-electron rule

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Summary


2024 ACF Winter at UC Berkeley	2024-11-16	Y	3	20.00	100%	100%	0%
2024 ACF Winter at Brandeis	2024-11-16	Y	10	12.00	60%	50%	10%
2024 ACF Winter at Clemson	2024-11-16	Y	6	15.00	83%	67%	0%
2024 ACF Winter at Clemson	2024-11-16	Y	2	25.00	50%	100%	100%
2024 ACF Winter at Clemson	2024-11-16	Y	1	10.00	0%	0%	100%
2024 ACF Winter at Clemson	2024-11-16	Y	1	30.00	100%	100%	100%
2024 ACF Winter at Lehigh	2024-11-16	Y	7	21.43	100%	100%	14%
2024 ACF Winter at Northwestern	2024-11-16	Y	9	17.78	78%	89%	11%
2024 ACF Winter at Ohio State	2024-11-16	Y	7	10.00	43%	57%	0%
2024 ACF Winter at Online	2024-11-16	Y	9	8.89	56%	22%	11%
2024 ACF Winter at UBC	2024-11-16	Y	3	20.00	100%	100%	0%
2024 ACF Winter at Oxford	2024-11-16	Y	10	12.00	60%	50%	10%

Data


Stanford L	Berkeley B	10	10	0	20
Berkeley C	Stanford A	10	10	0	20
Berkeley A	Stanford M	10	10	0	20
Boston University A	Boston University B	10	10	0	20
Bowdoin A	Amherst A	10	0	0	10
A Brandeis Supreme	Bowdoin B	0	0	0	0
Carabrandeis	Brandeises Brew	10	10	0	20
Northeastern A	Brown A	0	0	0	0
Williams A	Clark A	10	10	0	20
Diamond Brandeis	Yale B	0	0	0	0
MIT A	Tufts A	10	10	0	20
Tufts B	Yale C	0	0	0	0
Harvard A	Yale A	10	10	10	30
Georgia A	Georgia Tech F	10	10	10	30
Georgia A	Georgia Tech F	10	10	0	20
Georgia A	Georgia Tech C	10	10	10	30
Georgia A	Georgia Tech C	10	10	0	20
Georgia Tech B	Georgia A	0	10	0	10
Georgia Tech B	Georgia A	0	10	10	20
Georgia Tech B	Alabama A	10	10	0	20
Georgia Tech B	Alabama A	10	10	10	30
Auburn A	Georgia Tech A	10	0	0	10
Georgia Tech E	Alabama A	10	0	0	10
Georgia Tech E	Alabama A	10	0	10	20
Georgia Tech E	Auburn B	10	0	0	10
Georgia Tech E	Auburn B	10	0	10	20
Georgia A	Georgia Tech F	10	10	10	30
Georgia A	Georgia Tech F	10	10	0	20
Georgia A	Georgia Tech C	10	10	10	30
Georgia A	Georgia Tech C	10	10	0	20
Georgia Tech C	South Carolina A	10	10	0	20
Emory B	Tennesse B	0	10	0	10
Georgia Tech E	Alabama A	10	10	0	20
Georgia Tech E	Alabama A	10	10	10	30
Georgia Tech E	Auburn B	10	10	0	20
Georgia Tech E	Auburn B	10	10	10	30
Georgia Tech B	Georgia A	0	0	0	0
Georgia Tech B	Georgia A	0	0	10	10
Georgia Tech B	Alabama A	10	0	0	10
Georgia Tech B	Alabama A	10	0	10	20
Georgia Tech D	Tennesse B	0	10	10	20
Bard A	Lehigh A	10	10	0	20
Columbia A	Rowan A	10	10	0	20
Penn State A	Johns Hopkins B	10	10	0	20
UIUC D	Indiana B	10	10	0	20
Miami	Purdue D	10	10	0	20
Notre Dame	WashU C	10	10	0	20
UChicago C	Purdue A	10	10	0	20
UChicago A	Purdue B	10	10	0	20
WashU D	Purdue C	0	0	0	0
WashU B	UIUC A	10	10	0	20
UIUC B	Indiana A	10	10	0	20
SIUE A	UIUC C	0	10	10	20
CWRU D	CWRU C	0	0	0	0
Kenyon A	Michigan State C	10	10	0	20
Michigan D	Kenyon B	0	10	0	10
Michigan A	Michigan B	0	10	0	10
Michigan C	Michigan State B	0	0	0	0
Michigan State A	Ohio State A	10	0	0	10
Ohio State B	Pitt A	10	10	0	20
Penn B	Rutgers A	10	10	10	30
Haverford A	Penn State B	10	10	0	20
Penn A	Princeton A	10	10	0	20
Columbia B	Rutgers C	10	10	0	20
Arkansas	Texas D	10	10	0	20
Oregon State	NYU B	10	0	0	10
NYU A	Texas A	0	10	0	10
Colorado College	Texas C	10	0	0	10
Missouri	Vassar A	10	0	10	20
Vassar B	Ole Miss	0	0	0	0
WUSTL A	Mississippi State	10	0	0	10
Iowa	Texas B	0	0	0	0
McGill E	Central Oklahoma	0	0	0	0
UBC A	Alberta	10	10	0	20
UW B	SFU	10	10	0	20
UBC B	UW A	10	10	0	20
Southampton B	Birmingham	0	0	0	0
Bristol A	Manchester	10	10	0	20
Oxford A	Cambridge A	10	10	0	20
Cambridge C	Cambridge B	0	10	0	10
Durham A	Warwick A	0	0	0	0
Cambridge D	Imperial B	10	10	10	30
LSE A	Imperial A	10	0	0	10
Southampton A	Oxford B	0	0	0	0
Bristol B	Vanderbilt	10	0	0	10
Warwick B	Edinburgh	10	10	0	20