(a)
Interpretation:
The structure of the fragment in the EI mass spectrum of
Concept introduction:
In mass spectroscopy, compounds are identified on the basis of mass of compound. When the compound breaks into fragments then they can be distinguished from the other compounds. This technique is also used to differentiate the isotopes of compounds. This technique does not involve
(b)
Interpretation:
The structure of the fragment in the EI mass spectrum of
Concept introduction:
In mass spectroscopy, compounds are identified on the basis of mass of compound. When the compound breaks into fragments then they can be distinguished from the other compounds. This technique is also used to differentiate the isotopes of compounds. This technique does not involve electromagnetic radiations. Two peaks are used to identify the compound, the molecular ion which is the mass of the compound and base peak is the peak of most abundant element.
(c)
Interpretation:
The structure of the fragment in the EI mass spectrum of pentanol at
Concept introduction:
In mass spectroscopy, compounds are identified on the basis of mass of compound. When the compound breaks into fragments then they can be distinguished from the other compounds. This technique is also used to differentiate the isotopes of compounds. This technique does not involve electromagnetic radiations. Two peaks are used to identify the compound, the molecular ion which is the mass of the compound and base peak is the peak of most abundant element.
(d)
Interpretation:
The structure of the fragment in the EI mass spectrum of neopentane at
Concept introduction:
In mass spectroscopy, compounds are identified on the basis of mass of compound. When the compound breaks into fragments then they can be distinguished from the other compounds. This technique is also used to differentiate the isotopes of compounds. This technique does not involve electromagnetic radiations. Two peaks are used to identify the compound, the molecular ion which is the mass of the compound and base peak is the peak of most abundant element.
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Organic Chemistry Study Guide and Solutions
- 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.arrow_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 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_forward
- (a) Based on the mass spectrum shown below, 100 73 LOH 80 - A 58 20 - 100 10 20 30 40 50 60 70 80 90 100 110 m/z (i) identify the molecular ion peak of compound A. (ii) explain how the labelled fragments are formed. Relative Intensityarrow_forwardAccount for the presence of the following peak in the mass spectrum of hexanoic acid, CH3(CH2)4COOH. Q.) A series of peaks differing by 14 amu at m/z 45, 59, 73, and 87arrow_forwardIdentify and Interpret each fragment of the following mass spectrum: (write as text) *Molecule name: 2-propoxynaphthalene 100 BO 60 144 uma 40 186 uma 20- 25 50 75 100 125 150 175 m/z Relative Intensityarrow_forward
- 2,3-Dimethylbutane and 2,2-dimethylbutane have the same molecular ion in the mass spectrum, but only one of these isomers gives a significant fragment at m/z = 57. (a) Which isomer shows an intense peak at m/z = 57? (b) Propose a structure for the ion that gives rise to this peak. (c) The base peak in the mass spectrum of the other isomer occurs at m/z = 43. What ion gives rise to this peak?arrow_forwardThe base peak in the mass spectrum of 2,2,5,5-tetramethylhexane (molecular mass = 142) is at m/z = 57, which corresponds to a composition of C4H9. Suggest a structure for the fragment that accounts for this peak and offer a reason for why this fragment is so abundant.arrow_forwardWrite the different fragments produced in the mass spectrum of the following compounds: 1) 3-methyl-1-butanol 2) 2- butanone produced int he in mass spectroscopy?arrow_forward
- Shown below is the mass spectrum of a compound prepared using a Friedel-Crafts Reaction. Match the mass spectrum with one of the following compounds.arrow_forwardThe mass spectrum of 2,2-dimethylpropane shows only a very weak molecular ion peak at m/z = 72. However, a large peak at m/z = 57 is seen. Suggest a possible structure of the fragment giving rise to this large peak and suggest a reason as to why this peak is so large.arrow_forward(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?arrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning