hw7f08 - d) a sp hybridized orbital on the C and a 2p...

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HW Set #7 Due 11/18/08 (at the beginning of class) Work the following problems in chapter 6 10, 18, 30, 34 (use the MO diagram in figure 6.28), 52, 56, Chapter 7 14, 50 More problems The Born Openheimer approximation assumes that the electrons move much faster than the nuclei. This lets us assume the wavefunctions for the electrons in the molecule a) are independent of the position of the nuclei. b) depend only on the positions of the nuclei. c) are the same as the wavefunctions for the nuclei. d) the product of one electron wavefunctions. e) always even with regard to inversion symmetry. If you excited the electron in H 2 + from the 1 σ g state to the 1 σ u * what would expect to happen to the molecule? Which of the following has the highest bond order O 2 , O 2 + , N 2 , N 2 + ? In the molecule, H " C # N , the VB model would describe the sigma bond between the C and the N as a combination of a) 2p orbital on the C and a 2p orbital on the N. b) 2p orbital on the C and a 2s orbital on the N. c) 2s orbital on the C and a 2p orbital on the N.
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Unformatted text preview: d) a sp hybridized orbital on the C and a 2p orbital on the N. e) a sp 3 hybridized orbital on the C and a 2p orbital on the N. The molecule naphthalene is shown below. How would you describe the bonding in naphthalene using a mix of VB and MO? a) 12 C-C σ bonds (sp 2-sp 2 ), 12 C-H σ bonds (sp 2-1s), 6 π MO’s b) 12 C-C σ bonds (sp 2-sp 2 ), 10 C-H σ bonds (sp 2-1s), 6 π MO’s c) 11 C-C σ bonds (sp 2-sp 2 ), 11 C-H σ bonds (sp 2-1s), 5.5 π MO’s d) 11 C-C σ bonds (sp 2-sp 2 ), 8 C-H σ bonds (sp 2-1s), 5 π MO’s e) 10 C-C σ bonds (sp 2-sp 2 ), 10 C-H σ bonds (sp 2-1s), 5 π MO’s Why is there an energetic barrier to rotation of a C=C bond? a) The trans isomer is more stable than the cis isomer. b) Rotation breaks the σ C-C bond. c) Rotation breaks the π C-C bond. d) Repulsion between the groups bonded to the carbon atoms. e) There is no energy barrier to rotation of this bond....
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This note was uploaded on 07/20/2010 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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hw7f08 - d) a sp hybridized orbital on the C and a 2p...

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