Question

II. Number of Signals 2. Predict the number of unique protons that would generate peaks in an NMR spectrum. Look at Figure 13.6 and example problem 13.2 for guidance. Then for each of these unique proton signals, predict the ppm range where you would find it and the integration value or signal area. Look at figure 13.7 in your textbook. Finally, determine the splitting pattern (multiplicity) of the signal. This is predicted using the n+1 rule. Watch the video for figure 13.16 in your e-book before attempting this. Remember to look for symmetry. 3. Example: IEC Four signals predicted: 1. Ha, 0.5-1.0 ppm, integration 6, triplet 2. Hb, 1.2-1.5 ppm, integration 4, pentet (often just "mutliplet") 3. Hc, 1.5-1.7 ppm, integration 1, complex multiplet (note: the actual spectrum of this molecule is more complicated than this prediction) 4. Hd, 0.5-1.0 ppm, integration 3, doublet ole plane of symmetry

Answer 1

(c) 2,34 а CH3 Set of Proton ppm range Integration Multiplicity singlet singlet d 7.06 7.06d 2.1-2.4 3 а b 5.0-5.5 1 doublet 3 6.5-7.0 2 6.63 c C 6.63 d doublet 7.0-7.5 2 ОН ъ 5.35 а PPM (d) асHз blз.67 110 Set of Proton ppm range Integration Multiplicity S.11 H2N 1.0-1.5 doublet 1 3 a b multiplet doublet 2 3.4-3.8 1 4.75-5.25 2 с d singlet 4 11.0-11.5 1 а 10 12 11 0 PPM Note: values written are molecules are standard values but these are the range given in the table. While writting answer you may use range of these values.