The mass spectrum of 2,3-dimethylpentane also shows peaks at mlz = 57 and 43. Propose possible structures for the ions that give rise to these peaks.
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- 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/.)The mass spectrum and 13C NMR spectrum of a hydrocarbon are shown. Propose a structure for this hydrocarbon, and explain the spectral data.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.
- The mass spectrum (a) and the infrared spectrum (b) of an unknown hydrocarbon are shown. Propose as many structures as you can.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+=123.0320The mass spectrum of 2,3-dimethylpentane shows peaks at m/z = 57 and 43. Propose possible structures for the ions that give rise to these peaks
- The mass spectrum of 2,3-dimethylpentane also shows peaks at m/z = 57 and 43. Propose possible structures for the ions that give rise to these peaks.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.Assigning Possible Structures to Fragments in a Mass Spectrum The mass spectrum of 2,3-dimethylpentane [(CH3)2CHCH(CH3)CH2CH3] shows fragments at m/z = 85 and 71. Propose possible structures for the ions that give rise to these peaks.
- The mass spectrum of an alkene, C8H16, exhibits a peak at m/z = 41. Draw two isomers that are consistent with these data.A mass peak at m/z = 59 appears in the mass spectrum of an amide, C5H11NO. Draw the structure of a molecule that is consistent with this result.2-Methylpentanal and 4-methyl-2-pentanone are constitutional isomers with the molecular formula C,H,,0. Each shows a molecular ion peak in its mass spectrum at mlz 100. Spectrum A shows significant peaks at mlz 85, 58, 57, 43, and 42. Spectrum B shows significant peaks at mlz 71, 58, 57, 43, and 29. Assign each compound its correct spectrum. `H 2-Methylpentanal 4-Methyl-2-pentanone