Combined Spectral Problems: IR, ¹³C & ¹H* All spectra are either from SDBS (Japan National Institute of Advanced Industrial Science and Technology) or simulated. • Propose structures for the following problems. Use the tables on the following pages to show your work. 4000 200 180 CDS-00-156 C5H10O2 160 140 120 100 ppm 1500 80 60 mp T 40 T 20 0

Combined Spectral Problems: IR, ¹³C & ¹H* All spectra are either from SDBS (Japan National Institute of Advanced Industrial Science and Technology) or simulated. • Propose structures for the following problems. Use the tables on the following pages to show your work. 4000 200 180 CDS-00-156 C5H10O2 160 140 120 100 ppm 1500 80 60 mp T 40 T 20 0

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 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.
Methyl butanoate mass spectrum was obtained at 70eV. When the electron energy is lowered to a few eV above the ionization energy, the intensity ratio I [m/z 74] : I [m/z 71] increases considerably. Briefly explain this observation
Mass Spectrum 1000 - 800.0 600.0 400.0 200.0 0.000- 50.00 100.0 m/z 150.0 200.0 lamalan saldassallaalan C-H;BRO, D00 3000 2000 1000 500 HAVENUNBERIl Abundance
What information you can extract from these spectra, draw possible structures and libelled fragments with odd and even electron as well. i) li) LE LE CAH3O2 CH1IN MW. 08 M.W. - 73 M(88) 25 30 70 TO 75 miz
Which conclusion can you draw from the presence of the cluster from m/z=146-150? please give a long explanation
The following molecular ion isotopic clusters correspond to derivatives of benzene (C6H6) for which one or more of the hydrogens have been replaced with chlorines or bromines. What molecular formula corresponds to each mass spectrum? . 100- 80- 60- 40- Relative intensity 20- -M+6 -M+5 -M+4 M+3 M+1 M+2 M+0 (a) -M+6 -M+5 -M+4 M+3 M+2 M+1 -M+0 (b) M+6 M+5 M+4 M+3 -M+2 -M+1 -M+0 (c) M+6 -M+5 M+4 M+3 M+2 -M+1 -M+0 (d) M+6 M+5 -M+4 -M+3 -M+2 M+1 -M+0 (e)
The mass spectrum of n-octane shows a prominent molecular ion peak (m>z 114). There is also a large peak at m>z 57,but it is not the base peak. The mass spectrum of 3,4-dimethylhexane shows a smaller molecular ion, and the peak atmass 57 is the base peak. Explain these trends in abundance of the molecular ions and the ions at mass 57, and predict theintensities of the peaks at masses 57 and 114 in the spectrum of 2,2,3,3-tetramethylbutane.
c) The mass spectrum of 2,3-dibromopentane (CH; CHBr CHBr CH₂ CH3) includes the following peaks. Mass number (m/z) Relative abundance 15 29 107 109 199 201 203 i. What is the mass number of molecular ion, [CH; CHBr CHBr CH₂ CH₂]? Show your working. ii. Identify the molecular formula (including isotopic composition where relevant) of the 6 peaks. a b d 22 e f Mass number (m/z) 15 29 107 109 199 100 39 44 45 0.3 0.6 0.3 201 203 Molecule formula [CH₂]
A PLQ-PHY2054L.d 138 lbs to kg - G C Draw The Structu 4 Properties of Wa E Properties of Wa ngagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator=Dassignment-take ranslate Open Vellum Course Home [Review Topics] [References) The chemical environment of carbons can be deduced form their chemical shifts. Deduce the relative chemical shifts of the carbons at the labeled positions. (Carbons that are highly shielded have low delta, chemical shift, values.) 1) b. a The carbon with the smallest delta value (the most shielded) is c The carbon with the largest delta value (the most deshielded) is a 2) a C The carbon with the smallest delta value (the most shielded) is The carbon with the largest delta value (the most deshielded) is
Answer all of the following about colours and UV-Visible Spectra. a) The very idealized UV-Visible Spectrum of a violet solution of [Sc(H2O)6]** is shown: 3. wavelength A chemist carries out the following reaction: [Sc(H2O)s]* + Z yellow solution [ScZe]* (n depends on Z) Is Za solution of NH3 or a solution of NaBr? Justify your answer. Predict the shift (if any) in the UV-Visible Spectrum for [ScZ6]". Justify your answer. b) The following hydroxide species are all known: Mn(OH)42 Co(OH)4 Zn(OH). • Assign a colour to each species. Possible choices: blue, red, colourless Note: some choices may be used more than once, some not at all. Justify your answer for any one of the species.
YOU MUST SHOW YOUR WORK Molecular Formula: CH120 what is the proposed from the given data? IR Spectrum ΙΗ ΝMR VEMERI Signal Chemical Shift Integration 1H Multiplicity multiplet doublet of doublets Proposed Identity # Neighbors На 5.82 5.07 1H He 5.02 1H doublet of doublets singlet (exchanges) quintet triplet quintet triplet Ha 3.58 1H He 3.25 1H 1.98 2H H 1.48 2H Hi 0.9 3H 13C NMR Data 9.9, 30.7, 42.0, 74.6, 115.7, 135.1 ppm
A mass spectrum with M+ at m/z = 101 with a minor M+1 peak contains what diagnostic atom? I believe the substance talked about may be C6H15N but I am not sure. Please explain.