Question

II. NMR Spectroscopy. Show your work with some brief notes/explanations and any calculations as needed. 1. The expected 'H NMR spectrum of the following compound is expected to have signals with multiplicities A. three; two doublets and a triplet C.four, two singlets, a double and a triplet E. None of these B.three; a singlet, a doublet and a quartet D.four, two singlets and two triplets 2. Which of the following is the best prediction of the chemical shifts for the signals in the 'H NMR spectrum for the following compound? IV A. I = 0.9 ppm, 18 = 1.8 ppm, III = 4.2 ppm, IV = 1.9 ppm B. I = 0.9 ppm, 11 = 1.2 ppm, III = 3.7 ppm, IV = 1.9 ppm C. I = 0.9 ppm, Il = 1.7 ppm, III = 3.4 ppm, IV = 2.4 ppm D. I = 0.9 ppm, 11 = 1.7 ppm, III = 3.4 ppm, IV = 1.9 ppm E. None of these

Answer 1

M. F = CO HI2O2 CnH2n+2 I-H.D C 10 H2x10+2 = Clot22 the - Hiz = 5 benzene ring and - probable Stouchere may be one indicales one fool op ce) rel, id) (d) (C) CH2 (6) CH2 ra, cH3 a=1.0 ppm, 3H b = 1.5 ppm, 2H 2-5 ppm, 2H d= 7.1 ppm, 2H 8.0 ppm, 2H 11.0 ppm, 1H e = f=

of the the spectum expected HNMR following compound is expected to have multipicities three signals with Singlets of these Ans E. None (6) cal three singlets (a) (bi d) a=0.9 ppm d = 1.2 ppm c = x. I ppm 3.7ppm Ans B. 1=o.gppm, 11 = 1.2 ppm, 11 = 3.7 PP- 1 = 1.9 ppm