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- A H1 NMR signal is observed at 117.0 Hz (downfield of TMS) on a 1.20×102‑MHz instrument. a) What is the observed chemical shift in parts per million (ppm)? Chemical shift is ppm b) What is the chemical shift, in parts per million (ppm), if the sample is analyzed with a 60.0‑MHz instrument? Chemical shift is ppm c) Where will the proton signal appear, in hertz, if the sample is analyzed with a 60.0‑MHz instrument?According to this H NMR spectrum, identify the structure of the compound. the only additional information given is the molecular weight is 240.3 14 72 7.0 8 (ppm) 6.8 6.4 3.0 2.5 2.0 6 tppm)Which proton has the largest chemical shift? Smallest chemical shift? Hd He Hf
- esc Which compound corresponds to this IR and proton NMR? Transmitance 0.8+ 0.6- 0.4 0.2 10 noethane F1 2 3000 8 F2 7 # 3 INFRARED SPECTRUM 2000 Wavenumber (cm-1) 6 5 8 (ppm) c) ethanol 20 F3 $ 4 F4 4 2 1000 5 2 d) ethylbenzene F5 3 6 F6 0 & 7 F7What is the chmical shift for 13C-NMR signals ?A signal for an allylic proton was found to come at 2.43 PPM using a 300 MHz NMR instrument. What would the chemical shift of the same signal be using a 600 MHz NMR? O 1458 O 4.86 O 2.43 O 1.22
- Following are 'H-NMR spectra for compounds G, H, and I, each with the molecular formula C,H,,0. Each is a liquid at room temperature, is slightly soluble in water, and reacts with sodium metal with the evolution of a gas. (a) Propose structural formulas of compounds G, H, and I. (b) Explain why there are four lines between 8 0.86 and 0.90 for compound G. (c) Explain why the 2H multiplets at 8 1.5 and 3.5 for compound H are so complex. CH120 Compound G 6H 10 9 8 7 6. 3. 0 ppm Chemical shif (8)H NMR (300 mMHz, CDCl3, 21C) 0.92 ppm (t, 3H, J = 7Hz), 1.20 (s, 6H), 1.50 (q, 2H, J = 7 Hz), 1.64 (broad singlet, 1H). Choose the chemical shift of the three lines in the triplet signal at 0.92 ppm? (Select all correct answers) a b с d f b0 0.920 ppm 0.897 ppm 0.943 ppm 7.920 ppm 6.080 ppm 0.998 ppm 0.842 ppmWhat is NMR