CHEM 316 - Set 1 - Questions

CHEM 316 - Set 1 - Questions - a. Write the molecular...

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Chem 316 Problem Set 1 Fall 2007 1 Cl Cl Cl Cl O OH O OH OH O O CO 2 H N O OH N O N O OHC Br N O O N O O OH O H N OH 1. Draw the structure of 2-hydroxyacetonitrile, HOCH 2 CN, including unshared electron pairs. Use lines to show bonds. Do not show orbitals. Label each bond " σ " or " π ". Indicate the hybridization of each hybridized atom. Label the carbons and oxygen with their geometry and bond angles. H 2 N O 2. Indicate polarized bonds in these structures with the symbols " δ + " and " δ - ". Does each molecule have a dipole moment? CH 3 NH 2 H 2 C H C C H O CH 2 ClF H 2 C H C C H O 3. Sulfur dioxide, SO 2 , has a dipole moment. Draw a complete structure and predict its shape. (Sulfur is the central atom.) 4. Explain the dramatic difference in boiling point between these isomers. bp -24 ˚C bp 78 ˚C 5. Provide the following information for each of the molecules below:
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Unformatted text preview: a. Write the molecular formula, using the convention of C x H y ..... listing other elements in alphabetical order. b. Label each bond as " " or " ". c. Indicate the hybridization of each hybridized atom. d. Label the carbons and oxygens with their geometry and bond angles. e. Indicate any polarized bonds with the symbols " + " and " -". f. Indicate sites in each molecule that can act as hydrogen bond donors and/or acceptors. 6. For the following pairs of strucures: a. assign all formal charges; b. indicate whether they are resonance forms; c. if they are not resonance forms, explain why not. (All unshared electron pairs are shown.)...
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