Concept explainers
(a)
Interpretation: The fragments responsible for the given m/z values needs to be determined.
Concept Introduction: A mass spectrum is formed between intensity and m/z ratio which represents a chemical analysis. For a sample, mass spectrum is a pattern that represents the distribution of ion by mass in sample. Here, m/z ratio is mass to charge ratio of the sample.
(b)
Interpretation: The reason for very low density of the peak at 113 needs to be explained.
Concept Introduction: A mass spectrum is formed between intensity and m/z ratio which represents a chemical analysis. For a sample, mass spectrum is a pattern that represents the distribution of ion by mass in sample. Here, m/z ratio is mass to charge ratio of the sample.
(c)
Interpretation: The value of m/z needs to be calculated for the parent peak and reason for it to not observed needs to be explained.
Concept Introduction: A mass spectrum is formed between intensity and m/z ratio which represents a chemical analysis. For a sample, mass spectrum is a pattern that represents the distribution of ion by mass in sample. Here, m/z ratio is mass to charge ratio of the sample.
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EBK EXPERIMENTAL ORGANIC CHEMISTRY: A M
- 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+=123.0320arrow_forwardFollowing is the mass spectrum of 3-methyl-2-butanol. The molecular ion m/z 88 does not appear in this spectrum. Propose structural formulas for the cations of m/z 45, 43, and 41.arrow_forwardThe base peak in the mass spectrum of propanone (acetone) occurs at m/z 43. What cation does this peak represent?arrow_forward
- On each mass spectrum above, indicate the base peak and the molecular ion peak (or at least where you would expect to find it) and if the base peak on the mass spectrum for linalool has m/z 71, propose a structure for this fragment ion.arrow_forward14. Use the mass spectrum below to deduce the molecular formula of the molecule with each peak identification. [3] [CO03] [BTL3] 100 89 80 60 40 40 20 MASS SPECTRUM 0.0 10 20 30 m/z 40 50 50arrow_forward1. The two mass spectra below correspond to two isomers of C5H10O2: methyl butanoate and valeric acid. Match the spectrum with the appropriate compound. Place the m/z ratio and the structures (show all atoms) for the labeled fragments in the table below. 100 - Compound MS-NU-1708 Methyl butanoate 80 - 1 60 - 40 - CH3 2 H3C 20 - 10 20 30 40 50 60 70 80 90 100 m/z 100 - Compound MS-NU-3125 3 80 - Valeric acid 60 - 4 40 - H3C 20 - 10 20 30 40 50 60 70 80 90 100 m/z Fragment 1 Fragment 2 Fragment 3 Fragment 4 m/z 74 87 Fragment Relative Intensityarrow_forward
- The low-resolution mass spectrum of an unknown analgesic X had a molecular ion of 151. Possible molecular formulas include C7H5NO3, C8H9NO2, and C10H17N. Highresolution mass spectrometry gave an exact mass of 151.0640. What is the molecular formula of X?arrow_forwardWhich one of the given compounds is consistent with the mass spectrum below? Relative Intensity 100 80 60 40 20 MG-IM-3440 ofm 10 O 20 30 60 CH3CH₂CH(CH3)2 CH3CHOHCH₂CH3 CH3CH₂OCH₂CH3 CH3CH₂NHCH₂CH3 CH3CH₂CH₂CH3 80 wwwwwwwwww 90 70 m/z Courtesy of SDBS: National Institute of Advanced Industrial Science and Technology 100 www. 110 120arrow_forwardThe following is a mass spectrum of octane. 100 Relative Intensity 80 60 40 20 0 10 20 30 40 50 60 x Incorrect. m/z 70 80 90 100 110 Which peak represents the molecular ion? The molecular ion peak is expected to appear at m/z = amu.arrow_forward
- B. MASS SPECTRUM Identify the following from the low resolution mass spectrum of the unknown compound: 100 Relative intensity LT. 80 80 60 40 20 Base peak 0 20 Molecular lon peak 40 Mass Spectrum of Compound P 121 152 60 C. DOUBLE BOND EQUIVALENTS Calculate the DBE of the unknown compound. m/z This information indicates, for example, the presence of 100 Mass spectrum of the compound. 120 140 160 a + xarrow_forwardThe mass spectrum of compound B is shown below. 100 180 80 181 77 В 182 20 104 25 50 75 100 125 150 175 200 m/z (i) Identify the molecular ion peak of compound B. (ii) Explain the peak at m/z 182 in terms of intensity. (iii) Explain the formation of the other labelled fragments (m/z 180, 104 and 77). Relative Intensityarrow_forwardAccount for the presence of the following peak in the mass spectrum of hexanoic acid, CH3(CH2)4COOH. Q.) m/z 60arrow_forward
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