3. 09-07 - 9/7/2011 Which is the most acidic hydrogen in...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 9/7/2011 Which is the most acidic hydrogen in acetaldehyde? A B acetaldehyde Beginning on September 13 the first quiz of the day will be posted on the class web site. You should work this quiz on your quiz form and be prepared to turn it in for credit at the beginning of the class the following day. A B acetaldehyde HO O O N O OH O O O O OH O O O rapamycin 1 9/7/2011 dirt from a sewer in Easter Island Sardinia How many rings are present in rapamycin? A. 1 HO B. 2 HO O C. 3 O O N O OH O O O O OH O N O O D. 4 O OH O O O rapamycin cephalosporin O O OH O O O rapamycin a cephalosporin What does the wedge ( What is the formula of the cephalosporin? ) mean? A. C10H12N2O4S B. C9H10NO4S HO C. C10H12N2O3S O D. C12H14NO4S O N O OH O O O O OH H O O OH N H O pipercolic acid O rapamycin a cephalosporin Which hydrogen in cephalosporin is the most acidic? Are the following two molecules are identical? A. yes B. no HO O O O N O OH O O O O A OH O OH N H O H HO H H N O pipercolic acid O B rapamycin a cephalosporin 2 9/7/2011 How do we predict the best molecular shapes? What happens when we move structures around the screen? Valence Shell Electron Pair Repulsion theory VSEPR: Electrons assume a geometry that minimizes their repulsion. C C OH O N N H H H H O O O H HO N H HO OH pipercolic acid H O C the electrons and the atoms are trigonal planar C O How do we predict the best molecular shapes? What happens when we move structures around the screen? Valence Shell Electron Pair Repulsion theory VSEPR: Electrons assume a geometry that minimizes their repulsion. C C OH O H H N H H O pipercolic acid the electrons and the atoms are trigonal planar H N HO C O trigonal planar O O trigonal planar O N H C C O C OH O linear OH H VSEPR: Electron pairs assume a geometry that minimizes their repulsion. O B A the electrons are tetrahedral and the atoms are bent H bent bent O Valence Shell Electron Pair Repulsion theory H O H C How do we predict the best molecular shapes? What is the shape of the carboxyl group? trigonal pyramidal H O C O H N OH O OH O C C trigonal planar H O bent 3 9/7/2011 What is the geometry of the indicated atoms in rapamycin? How How many electron pairs are around the carbon atom? How many electron pairs are around the oxygen atom? planar A. bent B. linear C. trigonal planar D. trigonal pyramidal tetrahedral What is the geometry of the indicated atoms in the following structure? What is the nature of the bonds that can accommodate these shapes? VSEPR A. bent B. linear C. trigonal planar D. trigonal pyramidal What is the shape of the methyl cation? What is the shape of the hydronium ion? pyramidal planar pyramidal pyramidal D. planar planar tetrahedral What hybrid orbitals are used in the C-H bonds of the methyl cation? pyramidal C. VSEPR planar B. pyramidal A. A. Csp―Hs VSEPR VSEPR B. Csp2―Hs C. Csp3―Hs 4 9/7/2011 What hybrid orbitals are used in the C-H bonds of the methyl cation? What is the "molecular glue" that holds atoms together to give molecular structures such as rapamycin? HO O A. Osp―Hs VSEPR VSEPR B. Osp2―Hs C. Osp3―Hs O N O O O O O OH O O O rapamycin rapamycin Valence Shell Electron Pair Repulsion theory electron groups electron geometries hybrid orbitals examples molecular geometries 2 linear sp linear 3 trigonal planar sp2 trigonal planar 4 tetrahedral sp3 tetrahedral trigonal pyramidal bent 29 Using VSEPR what shape would be predicted for the amino group in the following structure? trigonal pyrimidal H H trigonal planar N C H O A. trigonal planar B. trigonal pyrimidal C. neither of these D. both of these H H H N C O 5 ...
View Full Document

This note was uploaded on 10/05/2011 for the course CHE 321 taught by Professor Fowler/sampson during the Spring '08 term at SUNY Stony Brook.

Ask a homework question - tutors are online