Bromine has two abundant isotopes, 79Br (51%) and 81Br (49%) . Chlorine has two abundant isotopes, 35CI (75%) and 37CI (25%). Carbon and oxygen have only one abundant isotope each. Which of the following molecules would you expect to show five molecular ion peaks with significant intensity in a standard-resolution mass spectrum? 3-bromopentane Trichloromethane O None of these Decane 1-bromo-2-chloroethane

Bromine has two abundant isotopes, 79Br (51%) and 81Br (49%) . Chlorine has two abundant isotopes, 35CI (75%) and 37CI (25%). Carbon and oxygen have only one abundant isotope each. Which of the following molecules would you expect to show five molecular ion peaks with significant intensity in a standard-resolution mass spectrum? 3-bromopentane Trichloromethane O None of these Decane 1-bromo-2-chloroethane

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter12: Structure Determination: Mass Spectrometry And Infrared Spectroscopy

Section12.SE: Something Extra

Problem 15AP: Write molecular formulas for compounds that show the following molecular ions in their...

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Write molecular formulas for compounds that show the following molecular ions in their high-resolution mass spectra, assuming that C, H, N, and O might be present. The exact atomic masses are: 1.007 83 (1H), 12.000 00 (12C), 14.003 07 (14N), 15.994 91 (16O). (a) M+=98.0844 (b) M+=123.0320
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.
Which of the following statements about the mass spectrum of CH3Br is correct? A.) presents two peaks of intensity 3: 1 with m / z equal to 94 and 96 b.) presents two peaks of equal intensity with m / z equal to 94 and 96 C.) presents a single peak of the molecular ion with m / z of 44 D.) has a single peak of the molecular ion with m / z of 95
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]
5. The mass spectrum of an unknown compound shows a molecular ion peak at m/z 119, with a relative intensity of 39. The M + 1 peak has a relative intensity of 1 and the M + 2 peak has a relative intensity of 38. A major IR stretch for the compound is observed at 2253 cm³¹. Additionally, the following ratio of elements was observed following elemental analysis: 20.03% C, 1.68% H, and 11.68% N. Provide a reasonable molecular formula and a structure for the unknown.
2. In a mass spectrum of a compound, the following data (intensity) is given. M+ = 80, M+ +1 = 8.8, M+ +2 = 26. This compound will have carbons and will contain a a. 8, sulfur b. 9, silicon c. 10, chlorine d. 11, bromine
iv
6.
Please answer all the necessary
6 A solid product obtained from the reaction of solutions of mercuric nitrate and potassium bromide yielded the following mass spectral data. Identify the compound and assign all masses in the spectrum according to isotopic content. Intensity Intensity m/e 366 364 363 362 361 360 359 358 357 356 354 2.2 11.9 4.2 12.2 10.0 21.2 10.1 11.25 5.8 3.45 0.05 m/e 285 283 282 281 280 279 278 277 275 81 79 0.6 3.2 1.1 4.6 2.6 2.9 1.5 0.9 0.1 17.0 17.3
Which of the following statements regarding mass spectrometry is incorrect? a. A compound whose molecules contain just one bromine atom shows two molecular ion peaks of similar intensity, one at +1 and one at -1 of the average m/z value b. Molecular ion peaks always have even-numbered values of m/z c. Only cations can be detected by a normal mass spectrometer d. In a normal mass spectrometer, electron impact causes a molecule to lose an electron and become a molecular radical cation which decomposes into fragment cations and radicals
3. Dibromocholestanol was analyzed by mass spectrometry using the electron impact (El) ionization technique. The following peaks were observed with relative intensities of ~1:2:1 Low Resolution MS (EI) m/z= 544, 546, and 548 Identify the peaks in the molecular ion pattern and which combination of isotopes produces these peaks: [M]: m/z = formula: [M+2]+: m/z = [M+4]+ : m/z = formula: formula: