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Chem 331 Quiz 1A Spring, 2006 Name______________________ 1. Draw a reasonable Lewis structure for methyl cyanate, CH3OCN H H C O C N H 2. One resonance structure is shown below. Draw a second resonance structure. Be sure to draw in formal charges to each of the atoms in both resonance structures below. Indicate which would be the major resonance contributor and explain. O O H2C H2C C CH2CH3 C CH2CH3 Major resonance structure is one on the right, because the negative charge is on the more electronegative atom. 3. Indicate the molecular geometry for each of the molecules shown below and indicate whether the molecule will be polar (i.e. will have a net dipole) or be nonpolar. Molecule Geometry Hybridization Polar or Non-Polar F C F F pyramidal sp3 polar CBr2F2 tetrahedral sp3 polar O S O bent sp2 polar 4. Use curved arrows to show the movement of electrons in the reaction shown below and label each reactant as a Lewis acid or a Lewis base: H H H O Lewis base + H C I H O C H + H Lewis acid I H 5. Write the conjugate acid and the conjugate base of ethanol, CH3CH2OH CH3CH2OH2+ CH3CH2O- conjugate acid conjugate base 6. In each of the following pairs, circle the compound that best answers the description a. stronger acid: CH3CO2H or FCH2CO2H b. stronger base: NH2- or CH3c. stronger acid: H2Te or H2Se 7. Write all of the isomers for C5H12 8. Name the following compound according to IUPAC rules: 2,3,4-trimethylheptane Chem 331 Quiz 1B Spring, 2006 Name______________________ 1. Draw a reasonable Lewis structure for methyl thiocyanate, CH3SCN H H C S C N H 2. One resonance structure is shown below. Draw a second resonance structure. Be sure to draw in formal charges to each of the atoms in both resonance structures below. Indicate which would be the major resonance contributor and explain. O H2C O C H H2C C H Major resonance structure is one on the right, because the negative charge is on the more electronegative atom. 3. Indicate the molecular geometry for each of the molecules shown below and indicate whether the molecule will be polar (i.e. will have a net dipole) or be nonpolar. Molecule O Geometry Hybridization Polar or NonPolar bent sp2 polar S O CCl2F2 tetrahedral sp3 polar Br C Br Br pyramidal sp3 polar 4. Use curved arrows to show the movement of electrons in the reaction shown below and label each reactant as a Lewis acid or a Lewis base: H H H N + H C H Lewis base I H N C H + H I H H Lewis acid 5. Write the conjugate acid and the conjugate base of propanol, CH3CH2CH2OH CH3CH2 CH2OH2+ CH3 CH2CH2O- conjugate acid conjugate base 6. In each of the following pairs, circle the compound that best answers the description stronger acid: BrCH2CO2H or CH3CO2H stronger base: OH- or NH2stronger acid: H3P or H3N 7. Write all of the isomers for C5H12 8. Name the following compound according to IUPAC rules: 5-ethyl-2,3-dimethyloctane
