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Midterm-2_Ochem_Ternansky

Midterm-2_Ochem_Ternansky - Chemistry 140A Fall 2010 Second...

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Chemistry 140A TOTAL POSSIBLE: 250 Fall, 2010 POINTS MISSED: - 0 Second Midterm Exam-250 points 11/18/10 TOTAL: 250 DO NOT OPEN THIS EXAM UNTIL INSTRUCTED TO DO SO ..... FILL OUT THE FOLLOWING INFORMATION NOW : . LAST NAME (Print): KEY FIRST NAME (Print): Ima PID: __________________________________________________ SIGNATURE: __________________________________________ ID checker initials: ____________________ If you wish to have any answers considered for a re-grade, your exam must be completed in INK .
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1. (20 points) You will recognize taxol (shown below) from exam-1. For each circled, numbered atom in taxol, designate (on the line provided) the chirality as “R”, “S” or “NC” (for “not chiral). O O H O O O OH O HO O O O O N H O OH 1 2 3 4 5 6 7 8 9 10 1. _______ 2. _______ 3. _______ 4. _______ 5. _______ 6. _______ 7. _______ 8. _______ 9. _______ 10. ______ S S S S S S S S R R ( 2 pts ea) 2. (18 points) Classify each of the following molecules as “chiral”, “meso and achiral”, or “achiral but not meso”. Make your selection by placing an “X” in the appropriate box below each structure. (2 pts each) CHIRAL MESO (achiral) ACHIRAL (NOT meso) CH 3 H CHIRAL MESO (achiral) ACHIRAL (NOT meso) CHIRAL MESO (achiral) ACHIRAL (NOT meso) H CH 3 Br H 3 C H Br CH 3 H Cl Cl H H
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Cl Cl CHIRAL MESO (achiral) ACHIRAL (NOT meso) H Br Br H CH 3 CH 3 O CH 3 CHIRAL MESO (achiral) ACHIRAL (NOT meso) CHIRAL MESO (achiral) ACHIRAL (NOT meso) Br Br H H H CH 3 CHIRAL MESO (achiral) ACHIRAL (NOT meso) CHIRAL MESO (achiral)
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