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Unformatted text preview: CHEMISTRY 140B NAME (please print) MIDTERM EXAM FIRST LAST A UG 18, 2008 (CP 10-13, V&S 5 TH ED) SIGNATURE ID NUMBER LAST NAME OF PERSON SEATED TO YOUR RIGHT : LAST NAME OF PERSON SEATED TO YOUR LEFT : DO NOT OPEN THE EXAM UNTIL YOU ARE TOLD TO DO SO . Please sign your name on the top of pages 1 through 7. Please check that you have 10 pages (including this one; page 10 is blank for your scratch work). Page 8 and 9 contain tables of NMR and IR data.- Answer only in the space provided. Do not write answers on the back of a page. _____________________________________ Question Points Score _____________________________________ 1. 70 _____ 2. 55 _____ 3. 50 _____ 4. 25 _____ _____________________________________ Total 200 _____ _____________________________________ H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn NAME:________________________________ 2 1a. ( 36 pts) On the lines provided, indicate the number of hydrogen and carbon signals present in the 1 H and 13 C NMR spectra for each molecule shown below (assume all samples are at room temperature and that a distinct resonance would be observed for nuclei in different environments): H C H C H C H C O Me Me OH O Br Br 3 2 2 3 2 2 4 3 1b. (20 pts) On the line provided, indicate the number of triplets expected in the 1 H NMR spectrum of each molecule. Assume that hydrogens in two different environments will exhibit different coupling constants to hydrogens in a third environment. Also assume that allylic and geminal couplings will be observable....
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