Identify some characteristic group frequencies in the spectrum of an organic molecule shown below and identify the class of molecules to which it belongs. Propose a struc- ture if you can. a (um) 7 8 9 10 11 12 1314 15 2.5 100 3 20 90 20 10 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400 Frequency (cm-1) Transmittance (%)

Identify some characteristic group frequencies in the spectrum of an organic molecule shown below and identify the class of molecules to which it belongs. Propose a struc- ture if you can. a (um) 7 8 9 10 11 12 1314 15 2.5 100 3 20 90 20 10 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400 Frequency (cm-1) Transmittance (%)

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...

See similar textbooks

Similar questions

Molecular Formula: C₁1H15O₂N ¹H spectrum 160 2H, d J = 7.5 Hz 13C spectrum 140 2H, d J = 7.5 Hz 120 100 5 PPM 80 PPM 60 1H, quintet J = 7 Hz 3 1 6H. triplet J = 7 Hz 4H, quintet J = 7 Hz 40 20
Which of the structures shown below the IR spectrum matches the IR spectrum below. 1 Relative Transmittance T 2000 Wavenumber (cm-1) NIST Chemistry WebBook (http://webbook.nist.gov/chemistry) 0.9 0.8 0.7 0.6 4000 3000 B 1000 ingit
A student takes an IR spectrum of an unknown compound. The IR spectrum shows significant stretches at 3159 cm³¹ (m, sh), 3089 cm ¹ (m, sh), 3000 cm ¹ (m, sh), 2997 cm-¹ (m, sh), 1620 cm-¹ (s, sh), 1494 cm-¹ (s, sh), and 1210 cm-¹ (s, sh). Which possible compound is it? Key: S = Strong, M = Medium, W = Weak, Sh = Sharp, Br = Broad Anisole Aniline O Acetanilide O Acetone O Phenol
(a) What would be the chemical shift of a peak that is observed at 655.2 Hz from the reference tetramethylsilane (TMS) recorded using a 90 MHz spectrometer ? (b) At what frequency would the chemical shift of chloroform (CHCl3, δ = 7.28 ppm) occur relative to TMS on a spectrum recorded on a 300 MHz spectrometer? (c) At what frequency and chemical shift would the signal for chloroform occur when using a 1 GHz NMR spectrometer?
Molecular formula: C10H1802 ¹H spectrum 1H, t J = 6.2 Hz 13C spectrum 180 160 2H, d J = 6.2 Hz 140 120 PPM 100 PPM 80 3H, s 60 3H, s 9H, s 40 20
What IR frequencies would enable a chemist to distinguish between these molecules? CH;CH2OH and CH;CH2OCH;CH3 and CH, HCHCHCCIICH CH, d 3000-3100 cm-1 (=C-H)| 1620-1680 cm-1 (C=C) 3200-3400 cm-1 (OH) || 3000-3100 cm-1 (=C-H)
Assigning Possible Structures to Fragments in a Mass Spectrum The mass spectrum of 2,3-dimethylpentane [(CH3)2CHCH(CH3)CH2CH3] shows fragments at m/z = 85 and 71. Propose possible structures for the ions that give rise to these peaks.
Calculate the exact resonance frequency for the two signals of 1,3-dichloropropane B = 3.75 Cl-C- C-C- B JAB=6.2 Hz A = 2.20 TMS 90 Hz, ア 6 5 4 2 1 O ô ppm I-0-IM I-U-IA I-y-IB
Amplitude ° Use the supplied NMR spectrum to gain insight into methyl silicylate. Decipher the spectrum by assigning hydrogen peaks in the molecule and include it with your report. 15- 10- 5- x103 12 ہیں OH Spectrum Scan [1/1] Oil of Wintergreen START END VALUE 11.21 10.47 0.98 8.30 6.41 4.00 5.55 5.04 0.40 4.47 3.45 3.00 мили ៖ 10 8 6 ppm 2
Absorption What type of transition is induced by the electromagnetic radiation mostly absorbed by these substances? -12 1.5 L4-20 min L6-30 min 1.2 -L8-50 min Original 0.9 0.6 0.3 400 450 500 550 600 650 700 750 S00
3. Attached is the IR for one of the compounds you crystallized in this lab. (a) Is this molecule 2- Naphthol, Acetophenone, Aniline or Vanillin? NAME the compound at the bottom of spectrum box. (b) Please identify and assign the major stretching vibrations. 100 Transmittance (%) 50- 4000 3000 1672 7 1666 6 3184 32 3021 50 2975 57 1598 10 2946 67 1690 10 2864 62 1511 10 2848 82 1455 18 2742 70 1464 32 12 1432 13 1398 52 1389 58 1373 66 1300 7 1266 4 1201 23 1500 Wavenumber (cm-¹) 2000 1172 13 1155 6 1125 24 1031 32 960 84 850 42 827 70 814 60 782 70 733 17 633 27 591 55 555 79 549 79 1000 500
Typo: The chemical formula is missing an oxygen. It should read as: C10H1202. Choose the correct structure of the compound with the following data. Formula: C10H120 100 - 50 4000 3000 2000 1500 1000 500 Wavenumber (3) (2) (5) múltiplet (2) 9 8 6 4 PPM II Ph - C-о-сH,CH-CH3 || Ph-c-CH2 -0-CH2CH3 || Ph -C- CH2CH2-0- CH3 A) B) Structure A O Structure B Structure C O=U O=U O=U Transmittance