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- When the 1HNMR spectrum of an alcohol is run in dimethylsulfoxide (DMSO) solvent rather than in chloroform, exchange of the Ο-H proton is slow and spin-spin splitting is seen between the Ο-H proton and C-H protons on the adjacent carbon. What spin multiplicities would you expect for the hydroxyl protons in the following alcohols? (a) 2-Methyl-2-propanol (b) Cyclohexanol (c) Ethanol (d) 2-Propanol (e) Cholesterol (f) 1-Methylcyclohexanol5. What is the expected Chemical shift of the proton of CH₂ Connected to Cl and C=C CICH₂CH=CH₂1. Predict the multiplicity of each signal in the expected proton NMR ('H NMR) spectrum for each of the following compounds (a)ı) (e) CI CN CI Č F F (b) (c) A Meo OH (d), 1
- Q4) Two Isomers have the chemical formula C,H, identify their structure based on their IR spectra below? Isomer A Ahserbane/ 3000 200 W es/e Isomer B Aboerkance/4Calculate the IHD of C7H6XNO and identify the important peaks in the following MS spectral data and draw the structure of the important peaks in the following MS spectral data.Which one of the following statements is not true? O If the two protons in a CH2 group are diastereotopic, they will couple with each other. O Helium-4 is a magnetically inactive nucleus. O If you cool cyclohexane to a low enough temperature, you can distinguish between the axial and equatorial protons in NMR spectroscopy. O The magnet in a 400 MHz NMR spectrometer is stronger than the magnet in a 500 MHz spectrometer. O You would observe carbon-carbon coupling in the 13C NMR spectrum of propane if each of the carbon atoms were carbon- 13. %23 2$ % & 3. 4 6 7 4 E R Y A D F G H. K C V alt N
- What is the structure from the formula C10H12O and the spectra?4. Match the following spectrum to the structure it represents а. 4000 2000 1S00 100 3000 OH OCH, CH3 он OCH3 он b. eo00 1500 1000 spo 4000 3000 он NH2 co,H но H3 CIdentify the relationship between the labelled protons as homotopic, enantiotopic or diastereotopic for the molecules below. Ha + Hb = Ha Hb Hc + Hd = سائل Hc. Hd
- Which of the following would not theoretically be seen in the splitting patterns for the 1Hb NMR signals for the following molecule if Jab < Jbc . CH; „Hb H;aC `CH2c-Br A. type b splits type a into a doublet B. type b splits type c into a doublet O C. type a splits type b into a septet then type c splits those into triplets O D. type c splits type b into a triplet then type a splits those into septetsThe proton NMR spectrum shown below belongs to which molecule? sept 10 ppm OH MacBook Air 20 D00 000 F4 F2 F3 F5 F6 F7 F8 2$ % & * 3 4 8 5 123Identify and draw the structure of the important peaks in the MS spectral data of C9H8O given below.