quiz8key - 4 , C 4 2 (=C 2 ), and C 4 3 . The C 2 '...

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CHEMISTRY 131 Quiz #8 Friday, March 21, 2006 Name: _____________________________________ 1. What is the name of the operation that produces each of the final orientations shown below? (6 points) Initial position Final position Operation F 1 + Xe F 2 + F 3 + + F 4 F 3 - Xe F 4 - F 1 - - F 2 i C 6 + C 5 + C 4 + C 3 + C 2 + C 1 + C 6 + C 5 + C 4 + C 3 + C 2 + C 1 + C 6 2 = C 3 Cl 1 Te Cl 4 Cl 3 Cl 2 Cl 4 Te Cl 1 Cl 3 Cl 2 σ v H 5 H 6 H 4 H 1 H 2 H 3 H 3 H 1 H 2 H 4 H 5 H 6 S 6 5 F 1 As Cl 4 Cl 3 Cl 2 Cl 1 Cl 4 As F 1 Cl 3 Cl 2 Cl 1 Invalid operation N H 2 H 3 H 1 N H 1 H 3 H 2 σ v
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2. The molecule in the first row in question 1 has a C 2 operation, 2 C 2 ' operations, and 2 C 2 " operations. Briefly explain where each of these operations are located. You may find it useful to redraw the molecule to answer this question. (4 points) The first C 2 operation (the one without any primes) is generated by the principal rotation axis, which is a C 4 axis. This axis generates three unique operations: C
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Unformatted text preview: 4 , C 4 2 (=C 2 ), and C 4 3 . The C 2 ' operations are generated by the two C 2 axes that are located perpendicular to the principal rotation axis, containing the fluorine atoms. The final two operations, the C 2 " operations, are generated by the remaining two C 2 axes that lie perpendicular to the principal rotation axis. They do not contain fluorine atoms, but they bisect the Xe-F bonds. The point here is that it is possible for a rotation axis to generate operations that are factors of the operation with the highest n. For example, a C 4 axis can generate a C 2 operation; a C 6 axis can generate C 3 and C 2 operations, and so on....
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This homework help was uploaded on 04/18/2008 for the course CHEM 131 taught by Professor Landry during the Spring '08 term at Vermont.

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quiz8key - 4 , C 4 2 (=C 2 ), and C 4 3 . The C 2 '...

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