2. What is the structure of the C,H,Br compound which gives rise to this 'H spectrum?The red numbers are the integration (number of hydrogens).Explain your reasoning.4765Chemical shift (5)3TMS432101,102>

Step 1: 1H NMR1H NMR (proton nuclear magnetic resonance spectroscopy) is a powerful analytical…

Answered: 2. What is the structure of the C,H,Br…

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

ChapterL3: Carbon (13c) Nmr Spectroscopy

Section: Chapter Questions

Problem 9CTQ

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SPECTROSCOPY - Attached are the IRs for Caffeine and Adenine (Molecular structures on Lab Manual p. 34). Please (a) NAME each compound at the bottom of each spectrum box. (b) Label the major peaks with the proper functional group for each spectrum. 100- Transmittance (%) Transmittance (%) 50- 4000 100 50 3303 34 1673 10 3123 20 1605 4 2982 42 1508 74 2800 43 1471 72 2710 50 1463 74 2892 49 1451 65 2601 68 1419 36 0 4000 3000 2925 4 2854 14 1699 10 1859 10 1699 49 3110 64 1649 31 2954 11 1457 21 1431 37 1404 56 1378 49 1360 49 1326 68 1368 60 1334 43 1309 27 1263 46 1156 81 1126 88 1023 72 3000 1286 63 1240 36 1213 80 1189 62 1072 77 1026 57 974 68 2000 1500 Wavenumber (cm-¹) 940 38 913 55 875 77 849 72 797 64 792 84 724 49 643 49 622 60 543 57 2000 1500 Wavenumber (cm-¹) 81 927 873 77 851 74 769 60 746 23 700 84 646 84 wwwm 638 86 610 57 482 49 1000 -END- 500 1000 500 38
Watch videos (LINKS) on page 2 and answer questions One infrared spectra (1) is given below. (a) Analyze the spectra and tabulate important bands. (b) Circle the possible molecular structure corresponding to the given spectra. Spectra A: 4000 2700 cm ¹ 2700- 2000 cm ¹ 2000 1600 cm 1600 - 400 cm ¹ 2.5 100 80 Region 60 40 20 0 OL 4000 (a) COMPOUNDS A OH 3500 3 -1 3000 B Absorption, cm -1 3.5 4 2500 4.5 SPECTRA 1 CH, O CH, C C CH, H H NO H wavelength (um) 5 5,5 6 2000 1800 1600 wavenumber (cm) wavelength (um) C Functional group CIC C-OH CH, 7 8 1400 1200 D 9 10 n 1000 CH₂CH₂OH - 11 Base Value 12 13 14 15 16 800 600 E Jun CH₂-C-N
4. A structure of molecular formula C5H₁2O has the following NMR: ¹H NMR (300 MHz, CDC13, 21C) 80.92 ppm (t, 3H, J = 7 Hz), 1.20 (s, 6H), 1.50 (q, 2H, J = 7Hz), 1.64 (broad singlet, 1H). What is the chemical shift of each of the three lines in the triplet signal at 0.92 ppm? Propose a reasonable structure given the ¹H NMR data.
4. Ethyl acetate and 2-butene-1,4-diol both have the molecular formula C4H8O2. How would you use infrared spectroscopy to distinguish between the two? Provide a thorough explanation.
The spectrum below was obtained from KBr sharing, being a compound with formula C2H6O. Determine the compound from the if FTIR spectrum. (b) Discuss how FTIR distinguishes the following compounds: (i) CH3OH and CH3CH2OCH2CH3 (c) which functional groups provide signals in the FTIR spectra: (i) 1700cm-1, (ii) 1550 cm-1 and (iii) 1700 cm-1 and 2510-3000 cm-1
The spectrum of trans-hex-2-enoic acid follows.(a) Assign peaks to show which protons give rise to which peaks in the spectrum.(b) Draw a tree to show the complex splitting of the vinyl proton centered around 7 ppm. Estimate the values of thecoupling constants.
Given the H-NMR spectra, identify the peaks that can be represented for 2-Naphthyl-Butylether.
A sample of dichloromethane has been contaminated with some 2,2-dichloropropane. The NMR spectrum of this sample shows two signals, one at 5.2 ppm and one at 1.9 ppm, corresponding to these two compounds respectively. The integrals of the two signals equate to 1:9 respectively. What is the mole percent of each compound in the mixture, or phrasing it another way, what percentage of the mixture is dichloromethane and what percentage is 2,2-dichloropropane?
The IR spectrum below belongs to an organic compound A having one nitrogen atom. Determine which structures that fits to the IR spectrum. Justify your answer by providing two (2) IR absorption peaks with their wavenumber. CN NH2 Ahsorbance / 4 50 100- 4000 3000 2500 2000 1500 1000 500 Wavenumbers / cm
Assign the C (Roman numerals) and H (Roman letters) atoms in the given structures using the 13C (top) and 1H (bottom) NMR spectra provided
6
6) The compound with the molecular formula C4H10O was synthesized. It was further analyzed using IR spectroscopy. The spectrum of the compound is illustrated below. Identify the structure of a compound. Justify your answer. Identify as many peaks on its IR spectrum as possible. (5 points) 100 80 60 60 %T 40 20 20 0 4000 R2020-93124TM 3000 2000 1500 1000 400 Wavenumber [cm-1]

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2. What is the structure of the C,H,Br compound which gives rise to this 'H spectrum? The red numbers are the integration (number of hydrogens). Explain your reasoning. 4 7 6 5 Chemical shift (5) 3 TMS 4 3 2 1 0 1,102>