2. Discuss the process of absorption of energy during the nuclear magnetic transitions. 3. Indicate the kinds of protons and number of PMR signals in the following compounds: a. CH3CH2CH(OH)CH3 b. CH3C(CH3)2CH2CH2CI C. CH3CH(OH)CH2CH3 4. Draw the structural formula of each of the following compounds and label all sets of equivalent protons. How many NMR signals do you expect from each of these compounds? a. Toluene b. Allyl bromide C. Cyclopropane d. Ethanol e. Acetone 12. A compound shows three signals a, b and c in its 1H NMR spectrum. The heights of integration curve at these signals are 8.8, 2.9 and 3.8 units, respectively. If the molecular formula of the compound is C11H16, count each kind of proton in it. 14. Predict the number of signals and their multiplicity in the 1H NMR spectra of the following compounds: CI CI CI . CI CI CI a. b. c. 15. Indicate the types of protons and their multiplicity in the 1H NMR spectra of the following compounds: a. b. d. 16. Draw the structure of each of the following compounds which meets the given requirements in its 1H NMR spectrum: a. C3H7Br (one doublet, 1 septet) b. C4H2Br20 (two triplets) C. C3H3Cls (one doublet, one triplet) d. C4H8O2 (one singlet, one triplet, one quartet) e. C4H100 (one singlet, one doublet, one septet) 17. In 1H NMR spectroscopy, what information can be obtained from the following: a. Number of signals b. Splitting of signals C. Chemical shifts d. Areas under peaks e. Coupling constants