Topic IV Bonding I GPAK

Topic IV Bonding I GPAK - structure of these peptide...

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----- -- Topic IV- Bonding I Group Problem Dra:v three Lewis resonance structures for the cyanate ion NCO- (C is the central atom). ASSIgn formal charges and rank the three structures in order of decreasing importance. Based on these structures, what would you predict for the approximate multiplicity of the NO and CO bonds? What shape is the molecule? +0 . .. , ± ±±±±±± ±±±± ±± C i4 ± ±±±± ±±±±± J...
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±± ±± ±± : (i I , , '--,e : " /" I . (Jl; . " " n ' ±± ± . , . Twist A Consider the molecule TeCl4 (with Te the central atom). Draw an appropriate Lewis structure ±±±± t1?s molecule. Does it require an expanded octet? What would you predict to be the IdealIzed electron geometry for this molecule? What would be the molecular geometry? Is the molecule polar or non-polar? ±± ±±±±±±± ±±±±±±±±± ! ±±± " CJ. . ±±±±±± =z.r , ' - "-_ . "-
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Twist B Proteins consist of amino acids linked together through "peptide linkages." The
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Unformatted text preview: structure of these peptide linkage units is usually written as: Q H II I -C-N-Complete the Lewis structure for the above peptide unit by adding in the lone pairs. An important structural feature ofthis peptide unit is that it is planar because the C-N bond has partial double-bond character, which prevents the rotation about the C-N that could occur if it were strictly a single bond. Draw a resonance structure for the peptide unit with formal charges that explains this partial double bond character. Based on your resonance structures, what would you predict about the multiplicity of the C=Q bond? What geometrical feature could you measure to determine the approximate mUltiplicity of the C-N and C=Q bonds, and what would you predict for it's value for these two bonds? , , ' 0 ' t+ f"" o c. h-d'" \' , f)J'" NL ..... G-N , . - _._ ---------...
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This note was uploaded on 12/05/2011 for the course CHEMISTRY 31 taught by Professor Roy during the Fall '09 term at Duke.

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Topic IV Bonding I GPAK - structure of these peptide...

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