neeed to check my answer 3. Attached is the IR for one of the compounds you crystallized in this lab. (a) Is this molecule 2-Naphthol, Aniline or Vanillin? NAME the compound at the bottom of spectrum box. (b) Identify andassign the major stretching vibrations. (Transmittance (%)100-50-0400030003184 32 1672 33021 50 1666 62975 57 1598 102946 67 1690 ID2864 62 1511 102848 82 1455 182742 70 1464 321432 131398 521389 581373 661300 71266 41201 2320001500Wavenumber (cm-¹)1172 131155 61125 241031 32960 84850 42827 70814 60782 70733 17633 2759155555649A79791000500

Answered: Image /qna-images/answer/a33c573c-d0df-4d5a-a983-a92ba711c502.jpg

3. Attached is the IR for one of the compounds you crystallized in this lab. (a) Is this molecule 2- Naphthol, Aniline or Vanillin? NAME the compound at the bottom of spectrum box. (b) Identify and assign the major stretching vibrations. ( Transmittance (%) 100- 50- 0- 4000 3000 3184 32 1672 7 1432 13 3021 50 1666 6 1398 52 2975 57 1598 10 2946 67 1690 ID 2864 62 1511 10 2848 82 1455 18 1389 58 1379 66 1300 7 1266 4 1201 23 2742 70 1464 32 2000 1500 Wavenumber (cm-¹) 1172 13 1155 6 1125 24 1031 32 960 84 850 42 827 70 WATYT 814 50 782 70 733 17 633 27 591 55 555 79 549 79 1000 500

3. Attached is the IR for one of the compounds you crystallized in this lab. (a) Is this molecule 2- Naphthol, Aniline or Vanillin? NAME the compound at the bottom of spectrum box. (b) Identify and assign the major stretching vibrations. ( Transmittance (%) 100- 50- 0- 4000 3000 3184 32 1672 7 1432 13 3021 50 1666 6 1398 52 2975 57 1598 10 2946 67 1690 ID 2864 62 1511 10 2848 82 1455 18 1389 58 1379 66 1300 7 1266 4 1201 23 2742 70 1464 32 2000 1500 Wavenumber (cm-¹) 1172 13 1155 6 1125 24 1031 32 960 84 850 42 827 70 WATYT 814 50 782 70 733 17 633 27 591 55 555 79 549 79 1000 500

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter14: Mass Spectrometry

Section: Chapter Questions

Problem 14.26P: Following is the mass spectrum of bromocyclopentane. The molecular ion m/z 148 is of such low...

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Following is the mass spectrum of an unknown compound. The two highest peaks are at m/z 120 and 122. Suggest a structure for this compound. (Data from http://webbook.nist.gov/chemistry/.)
Following is the mass spectrum of bromocyclopentane. The molecular ion m/z 148 is of such low intensity that it does not appear in this spectrum. Assign structural formulas for the cations of m/z 69 and 41.
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
Q1 (a) Explain how the peaks in Infra-Red spectroscopy are generated and what information the peaks can provide about the molecule analysed.(250 words limit) 25% (b) Explain how interaction of Ultra-Violet / Visible light with a molecule produces an absorbance and hence a peak, indicating what parts of a molecule can absorb this radiation. (250 words limit) (25%)
In a 300 MHz NMR spectrometer, A) what is the Larmor frequency in MHz of a 15N nucleus? g H = N 26.752; g = 2.7126; B) Using the same NMR instrument, suppose that a 13C nucleus from a sample generates a signal which has a frequency of 11,250 Hz higher than that from the carbons in TMS. What is the chemical shift of that carbon atom from the sample? A) 30 MHz; B) 0.15 ppm OA) 25 MHz; B) 0.35 ppm A) 35 MHz; B) 0.30 ppm OA) 25 MHz; B) 0.55 ppm
3. Identify C-Cl stretching peaks in CDC13 and CHC13 spectra. Do these peaks have exactly the same frequencies for both compounds? Explain your answer. 4. Is the C==O stretching frequency the same for acetone and deuterated acetone? Explain your answer. 5. Identify C==O overtone in acetone spectrum which corresponds to the transition from ground level, n=0, to the second excited level, n=2.
(b) Indicate whether the following vibrations are active or inactive in the IR spectrum, justify your answer. Molecule Motion CH3 – CH3 C - C stretching (ii) CH2 = CH2 C - H stretching C = c (iii) CH2 = CH2 CH2 twist C = C (iv) CH2 = CH2 C - H stretching C = C H
(a) Calculate the energy difference between the two spin states of 1H and of 13C in a magnetic field of 6.8 T. 1H 4.0 1.91e-29 X J 13C 4.80e-33 X J (b) What is the precession frequency of a 'H nucleus at this magnetic field? Of a 13C nucleus? 1H 4.0 290 MHz 13C 4.0 73 MHz (c) At what magnetic field do protons precess at a frequency of 300. MHz? [4.0 7.04
Which of the following vibrations will be infrared-active and which should be infrared-inactive? (a) The C=O stretch in propanone (b) The C=C stretch in trans-3-hexene (c) Cyclohexane ring "breathing" (simultaneous stretch of all C-C bonds) (d) The N-O stretch in nitromethane (CH3NO2)
Two infrared spectra are shown. One is the spectrum of cyclohexane, and the other is the spectrum of cyclohexene. Identify them, and explain your answer. (a) 100 * 80 60 40 20 4000 3500 3000 2500 2000 1500 1000 500 Wavenumber (cm-1) (b) 100 * 80 60 40 20 Transmittance (%) Transmittance (%)
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
(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?