2 (b) In the following reaction, compounds B or C might be formed. HCI or в с (i) By using the 'H NMR spectra, explain the difference in these two products. (ii) In a mass spectrum of compound B, identify the m/z for the molecular ion peak(s). (iii) Explain the intensity of the molecular ion peak(s) observed in (ii). (iv) For compound C, propose a cation structure at m/z 71.

2 (b) In the following reaction, compounds B or C might be formed. HCI or в с (i) By using the 'H NMR spectra, explain the difference in these two products. (ii) In a mass spectrum of compound B, identify the m/z for the molecular ion peak(s). (iii) Explain the intensity of the molecular ion peak(s) observed in (ii). (iv) For compound C, propose a cation structure at m/z 71.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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The reaction of l2 with Na11BH4 yields a gaseous product with an empirical formula of BH3. a) Draw the structure of the gaseous product. b) Predict the 11B NMR spectrum of the product and hence state how it differs from the spectrum that would be expected for monomer BH3. c) The 'H NMR spectrum of the product gives two signals. One signal is a septet of quintets and the septet has a relative intensity of 1:2:3:4:3:2:1. This signal may be assigned to a proton environment which is not explained by valence bond theory. [For 1"B: I = 3/2]. i) Identify this proton environment and explain why it is unusual. How may the bonding be explained? ii) Explain why the 1:2:3:4:3:2:1 relative intensity in the NMR signal is so diagnostic of the unusual environment
kindly answer this question A & C
The NMR spectra for compound 1 were acquired in a 7.5 mg / 0.6 mL solution ofCDCl3 The 1H and 13C peaks are also listedbelow. Provide a full analysis of the NMR spectra for compound 1.1H NMR (400 MHz, CDCl3) δ 7.73 (d, J = 9.5 Hz, 1H), 7.56 (ddd, J = 8.5, 7.5, 1.6 Hz, 1H),7.51 (dd, J = 7.5, 1.6 Hz, 1H), 7.36 (d, J = 8.5 Hz, 1H), 7.30 (dd, J = 8.5, 7.5 Hz, 1H), 6.45(d, J = 9.5 Hz, 1H).13C NMR (101 MHz, CDCl3) δ 160.79, 154.09, 143.43, 131.85, 127.87, 124.44, 118.86,116.94, 116.74.
2. (a) Examine the 1H NMR spectrum shown below: 3 PPM Consider the following compounds: A - D NH А В C D (i) Which compound corresponds to the NMR spectrum shown? Justify your answer. (ii) For the other three compounds not selected in (i), explain what you would expect their respective 1H NMR spectrum to look like. Justify your reasoning.
(c) Assign the correct structure for compound M with molecular formula C5H100, which has 'H-NMR signal at 8 = 5-64 (A), 5:53 (B), 4-23 (C), 1-92 (D), (D)is an exchangable singlet (with D20). . multiplets, (Ẹ) and (F) are doublets and a E 1:68 (E) and 1-24 (F)" in рpm. JAR = 16:3 Hz. (A), (B)_ and (C) are (A), TB). and (C) are
Compound C shows a molecular ion at m/z 148 and other prominent peaks at m/z 105 and 77. Following are its infrared and 1H-NMR spectra. Q.) Deduce the structural formula of compound C
6. (Chapter 15 - 47b) An aromatic compound, C9H12 has the following H NMR spectrum and a peak at 750 cmt in its IR spectrum. Answer the following questions. Chem. shift Rel. area 1.19 2.31 2.64 7.13 1.50 1.50 1.00 2.00 TMS 10 3 O ppm Chemical shift (6) 4(a). The IR peak at 750 cm in its IR spectrum indicate that the compound is. disubstituted = 4(b) The name of the compound is = Intensity-
20. (a) The UV spectrum of acetone shows two peaks at 15. 7-max = 280 nm max = 1900 nm Emax max and 100. (1) identify the electronic transition for each. (ii) which one of these is more intense ? (b) Why is methanol a good solvent for UV but not for IR determination? 21. (a) How will you detect C=C-C=Cby UV spectroscopy? (b) Write why absorption bands are formed in ultra-violet spectrum instead of sharp peaks ?
5. How does the proton (¹H) NMR of the methyl benzoate reagent compare to the methyl 3-nitrobenzoate product? Include (or illustrate) the NMR plots and peak assignments for each.
(b) The proton decoupled compound A (COH1202) còntain three peaks-13, 40, 60, 130-138 (4 peaks), 13 C spectrum of 172 n proton coupled C ppm. In spectrum the peaks at 13 ppm. 40 and 60 ppm split into quartret, triplet and triplet respectively. Suggest a`structure. for the compound A. Explain your deduction. If you take a DEPT-135 spectrum, then what will be the nature of these peaks? What 13C proton coupling constant (' J) would you expect for the peak at 13 and 40 ppm?