2007Final 2203-7 Answers - CHEMISTRY 2203/7 Dec 2007 Final...

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CHEMISTRY 2203/7 Dec. 2007 Final 2 1 . GIVE SHORT ANSWERS TO THE FOLLOWING QUESTIONS IN THE SPACE PROVIDED (15 Marks). a. Give the three hybridization states commonly found in organic compounds. Draw three simple molecules that illustrate the geometry of each states. H H H H H H H H sp3 sp2 H H sp b. Define” reduction” with reference to organic reactions. Addition of H 2 or removal of electronegative atoms c . Give the generalized chemical equation for the dissociation of an organic acid HA (pKa). HA + H 2 O A - + H 3 O + d. What are the key differences between S N 1 and S N 2 mechanisms? (Consider kinetics and stereochemistry). S N 1 – unimolecular kinetics and racemization and S N 2 bimolecular kinetics and inversion e . Draw the structure of a typical carbocation in 3-d perspective. f . Assign the ( R ) or ( S ) configuration to the chiral (stereogenic) centers of the molecule shown below. F H H F (S) (R) g . Define what is meant by electronegativity in reference to organic compounds. Ability of an atom to attract electron density to itself in a covalent bond … Highly electronegative atom bears negative charge well and positive charge not well h . Define the essential difference between an “aromatic” and “antiaromatic” compound? Be specific.
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2007Final 2203-7 Answers - CHEMISTRY 2203/7 Dec 2007 Final...

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