Concept explainers
(a)
Interpretation:
The
Concept introduction:
Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as
(b)
Interpretation:
The
Concept introduction:
Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as
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Organic Chemistry Study Guide and Solutions
- 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/.)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_forwardWrite 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_forward
- The mass spectrum and 13C NMR spectrum of a hydrocarbon are shown. Propose a structure for this hydrocarbon, and explain the spectral data.arrow_forwardWhat fragments might you expect in the mass spectra 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
- Which of the following molecules matches the given data? (Note: All the molecules have a M+ = m/z 102) C5H10O2 base peak = m/z 43arrow_forward1 (c) 2-Methyl-3-pentanol reacts with PCC to form compound F. (i) Draw the structure of F. (ii) In the mass spectrum, identify the m/z value of the molecular ion peak for compound F. (ii) Fragmentation of radical cation F exhibits two fragment ion peaks at m/z 57 and m/z 71. Propose the structures of these two fragments. (iv) Draw the resonance structure for each of the cation in (iii).arrow_forwardThe mass spectrum of 1-propanol shows a large peak at m/z=31. Draw the structure of the fragment and explain why it is particularly stable.arrow_forward
- 1. 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_forwardThe two mass spectra below correspond to two isomers of C5H10O. Match the spectrum with the compound and draw the fragment ion that corresponds to the base peak.arrow_forwardAlthough 2,2-dimethylhexane has a molecular weight of 114, no peak is observed at m/z = 114. The base peak in the mass spectrum occurs at M-57 (a) Draw the fragmentation responsible for the formation of M-57 ion (b) Explain why this cation is the most abundant ion to pass through the spectrometer. (c) Explain why no molecular ion survive long enough to be detected. (d) Can you offer an explanation as to why M-15 peak is not the base peak?arrow_forward
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