reson_an

# reson_an - The actual bond length for carbon monoxide is...

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For the following Lewis structures, do the following: A. Assign formal charges to any atoms that posses a formal charge; note, all valence electrons are shown. B. Draw another resonance form that is more important (major form) than the Lewis structure provided. Used curved arrow notation to show the movement of electrons that produces the new resonace contributor. Be sure that your new resonance contributor is a proper Lewis structure with formal charges applied correctly. Explain why you new rewsonance contributor would be considered the major form. C.Use the overhead Bond Type and Bond Lenghts, http://myweb.unomaha.edu/~dstack/2250/Overheads/s5b_BOND2.pdf, to provide an estimate for the bond indicate in each structure, C O A) CH 3 B) C) CH 2 D) o C O estimate for the C-O bond: estimate for the C-N bond: Halway between 1.22 A and 1.16 A would be 1.19 A. But the second structure is the major contributor, so 1.17 A would a good estimate. estimate for the C-O bond:
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Unformatted text preview: The actual bond length for carbon monoxide is 1.128 A C O H N H H estimate for the C-N bond: C O CH 3 CH 2 major b/c negative charge is on the more electronegative atom Csp-Osp2, σ = 1.18 A Csp2-O sp3, s = 1.39 A Halfway between 1.24 A and 1.39 A would be 1.315 A. But the second structure is the more important contributor, so 1.33 A would a good estimate. Csp-Nsp2, σ = 1.22 A Csp-Nsp, σ = 1.16 A C O H N H H major b/c this structure has less charge separation N C O N C O major b/c negative charge is on the more electronegative atom Csp2-Nsp2, σ = 1.26 A Csp2-Nsp3, σ = 1.37 A Halfway between 1.26 A and 1.37 A would be 1.315 A. But the second structure is the more important contributor, by a large margin so 1.35 A would a good estimate. C O Although this strucutre has more charge separation, both the oxygen and the carbon have an octet in this structure (primary bonding force). Csp-Osp, σ = 1.10 A...
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