MT1_key - Chem 112A First Midterm October 7th 2010 Please...

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Unformatted text preview: Chem 112A: First Midterm October 7th, 2010 Please provide all answers in the space provided. You are not allowed to use a calculator for this exam, but you may use (previously disassembled) molecular model kits. Including the title page, there should be 8 total questions spread over 6 pages. There is also a seventh page that should be blank. You can use this last page for scratch paper if you need it, but please remember to copy your answers into appropriate exam question. Name: GSl/Seetion: (l) (6 points) (2) (14 points) (3) (15 points) (4) V (10 points) (5) (13 points) (6) _ (12 points) (7) (12 points) (8) (18 points) TOTAL (100 points) . Predict the most acidic proton for each of the following compounds. BRIEFLY justify your answer (3 points each): / Z\ / SF i; were a. C' H ad :L 41"“ a F F 9‘73 C‘l—K) (>le O :8 more \(Aoévtcfif'IVC MM c. H . O O O MOS-(— Pogg‘gLe H0 13. W d. ragwaww O C] S ‘. I nob-x 0% v e, O C 0 we 0 0‘ 0 — .0 ,0 MA r-l: Y (Aim-1 «4., ocf—uw‘ U 4'7 g e» . Fill in the missing reagents for each of the following organic transformations (3 points each). 0 H10 Cl 0 HE'COAQZ. OH A + b. “to v ‘ 30 no+ 0&4 A44 m —* 40 L)p‘gH‘1 Wrrawgawk’ 5. Provide a full conformational analysis of the following compound by completing the following steps: “'10—: b look down this bond (P'— = 21. Draw Newman projections corresponding to all of the staggered and eclipsed conformations of this molecule by looking down the indicated bond. Label each as “staggered” or “eclipsed” (7 points). 1- pr "Pt' ( r H CH i 3 H \ w; H’ H \ H ’1 Me H l MC H CKBMQ @ O ' Cukth‘X @Loo‘ @VLO‘K- €0<3P$¢V€ L er “PF LPr‘ H H K3C. H @ H34 H Ma H [.1 Me H Me. 0H («t 3 ‘ / C2) I v - qu- t» I 300"~ l-a «QM—w! gNeifJankfatgghé cod @ CC P32 C } nformations that you provided for part a in the order of increasing energy. Start your numbering by assigning the lowest energy conformation as “l ” (3 points). c. Using the coordinate axes that are provided, plot the energy of the conformers that you drew in part 21. Label the maxima and minima with the numbers you assigned in part b. You do not need to provide any specific energy values or re-draw the Newman projections (3 points). relative energy 0 (.0 lZO No No 300 SM . Circle and identify the functional groups in the following compounds. You do not need to specify the “alkyl” and “aromatic” groups as part of your answer (3 points each). e‘S'L « «Lari-hum]! «allth \8 a. w 0 G 0‘ t d. «Nob v‘ (atth i ‘ c mafia 0L; \ @ “Aw WP ' Jaw 6. Ca «40:2 .‘c act b . Provide an orbital interaction diagram for l ,1 -difiuor0ethene considering only the carbon—carbon double bond. Clearly label molecular orbitals that you generate. Finally, sketch the highest energy molecular orbital that contains electrons and the lowest energy empty orbital on the structures at right (10 points). H F )=( 1,1—difluoroethene H F Highest energy orbital that contains electrons: orbital interaction diagram: I I \‘ Hm" 97 “‘“F I \ x n: ,/‘____..‘t‘ —n H/O,;_ \F , I . ‘ \ \ K ‘ ‘ \ ~ \C ' \\ ~ \li,:l: Lowest energy orbital that is unoccupied: o \ \ ’, fie \ \jl/ / ’ F \ n" ‘ “ * H”"’I, I ‘\““‘F \ ‘I Q" . ’i C\ . 4b 0, 77 - / @F 1. Provide IUPAC names for each of the following compounds (3 points each): q'el’avl' 1iz*°fll~d’e‘1(°clawc (5)4-6‘491 l- 2,3— or. «all»? l -3 - M944.“ 2‘ Provide accurate structures of each of the following alkenes (2 points each): a. l—he tene p W @ b. (D-S-methyl—3—hexene c. (B—4-methyl-2-hexene \ 6) d. 2,3—dimethyl—2—pentene /’\/\ e. (E)-4,4-dimethyl—2—pentene /\\)< (g) f. Rank the structures you provided above in terms of their relative energies (I being the lowest and 5 being the highest, 4 points). 8. Provide arrow pushing mechanisms for each of the following reactions (6 points each). Cl2 / H2O OH a- \J§/\/ '“—) QS/v CI ' H F CHI 53“ V M fl“) Viv/V > VK/V 9C“ C\.\ >Cl—C:i * “L?” I \/ (ng-‘w‘u ts \XPV 6‘) LL95 W7) Ci b o '2 O 0 HOW base I d :Irli 0 gas; 0 0 N“ U H 1%AW “3 -0JL/\//</ > ‘0 W H2SOA(aQ) O -H-+ g< “Lana " > > V HQ. (1 é Oak/JFS \. ...
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