L17S07_VSEPR_Isomers_Stereochemistry 02-26-07

L17S07_VSEPR_Isomers_Stereochemistry 02-26-07 - L17:...

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Unformatted text preview: L17: " VSEPR, Isomers, Sterochemistry" Summary 2004 M.Kubinec, A.Pines L17-1 Valence-Shell Electron Pair Repulsion (VSEPR) Model Shapes Valence2 3 linear trigonal planar 180 180 120 120 109.5 109.5 4 tetrahedral 120 trigonal 120 bypyramidal 90 90 Steric Number = # lone e-pairs + e# bonded atoms 5 6 octahedral 90 90 90 90 L17-2 2004 M.Kubinec, A.Pines ChemQuiz 17.01 Which of the following molecules or ions is linear? linear? Y X Y 1) ICl2 2004 M.Kubinec, A.Pines - 2) BrF2+ BrF + 3) H2S L17-3 2004 M.Kubinec, A.Pines 1 L17: " VSEPR, Isomers, Sterochemistry" ChemQuiz 17.02 In the following acid-base acidreaction, which species has the largest bond angle? angle? H3O+ + NH3 1) H3O + 2004 M.Kubinec, A.Pines NH4+ + H2O + 3) NH4 L17-5 2) NH3 Polymerization -A-B-A-B-A-BH H H-N-(CH2)6-N-H - - - - Hexamethylene diamine Summary = A O O Cl-C-(CH2)8-C-Cl Cl= Sebacoyl Chloride B Molecules of the same formula with different arrangements of the atoms Isomers Structural HH H-C-C-O-H HH - Cl Cl C=C H H Cl H Stereo Cl H C=C H Cl .. A.Pines,M.Kubinec,UCB .... L5-10 H H H-C-O-C-H H H - A.Pines,M.Kubinec,UCB C=C Cl H L6-10 Chiral Molecules Alanine N C C O O C O O N C C C Left-handed LeftDNA Helix L D 2004 M.Kubinec, A.Pines A.Pines,M.Kubinec,UCB Right-handed RightDNA Helix L17-7 L5-9 Polymerization H H H-N-(CH2)6-N-H Hexamethylene diamine A -A-B-A-B-A-B= O O Cl-C-(CH2)8-C-Cl ClSebacoyl Chloride B .. 2004 M.Kubinec, A.Pines = .... L17-8 2004 M.Kubinec, A.Pines 2 L17: " VSEPR, Isomers, Sterochemistry" In the polymerization of ethylene to polyethylene the H-C-H bond angle.... H2C CH2 H2C CH2 H2C CH2 ChemQuiz 17.1 ... CH CH CH CH CH CH ... 2 2 2 2 2 2 1) Increases 2) Same 3) Decreases L17-9 2004 M.Kubinec, A.Pines Molecules of the same formula with different arrangements of the atoms Isomers Structural HH H-C-C-O-H HH - - - Cl Cl C=C H H Cl H Stereo Cl H C=C H Cl H H H-C-O-C-H H H - 2004 M.Kubinec, A.Pines C=C Cl H L17-11 ChemQuiz 17.2 C5H12 How many structural isomers are there of CH2 CH2 the hydrocarbon "pentane"? " pentane H3C CH2 CH3 1) 3 2004 M.Kubinec, A.Pines 2) 5 3) 7 L17-12 2004 M.Kubinec, A.Pines 3 L17: " VSEPR, Isomers, Sterochemistry" Isomers: Stereo (Chiral) Enantiomers L 2004 M.Kubinec, A.Pines D L17-14 sfs Non Superimposable Mirror Images 2004 M.Kubinec, A.Pines L17-15 sfs Non Superimposable Mirror Images 2004 M.Kubinec, A.Pines L17-16 sfs 2004 M.Kubinec, A.Pines 4 L17: " VSEPR, Isomers, Sterochemistry" Chiral Molecules Alanine N C C O O C O O N C C C Left-handed LeftDNA Helix 2004 M.Kubinec, A.Pines L D Right-handed RightDNA Helix L17-17 ChemQuiz 17.3 Which of the following structural isomers of octane is chiral? chiral? CH2 CH3 C C CH2 CH2 CH2 CH2 CH3 CH2 - C C - - 2004 M.Kubinec, A.Pines Lecture Complete 2004 M.Kubinec, A.Pines 2004 M.Kubinec, A.Pines 5 - - 1) C-C-C-C-C C-C 2) C-C-C-C-C C - - 3) C-C-C-C C - C C L17-18 L17-20 ...
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