The mass spectrum of compound B, a colorless liquid, shows these peaks in its mass spectrum. Determine the molecular formula of compound B and propose a structural formula for it. Relative Abundance mlz 43 100 (base) 78 23.6 (M) 79 1.00 80 7.55 81 0.25
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- Draw the structure of the important peaks in the mass spectrum of C9H8O (unsaturation = 6) Major Peaks: m/z = 132, 103, 77, 53A compound used as a moth repellant has three molecular ion peaks at m/z = 146 (100%), 148 (65%) & 150 (10%) amu in its mass spectrum. A pair of smaller peaks are seen at m/z= 111 (34%) & 113 (11%). The infrared spectrum shows sharp absorption just above 3000 cm^-1 region, and also at 1480 cm^-1. The ^1 H nmr shows a single sharp signal at delta = 7.2 ppm, and the ^13 C nmr has two signals (delta = 133 & 130 ppm).The mass spectrum of an alkene, C8H16, exhibits a peak at m/z = 41. Draw two isomers that are consistent with these data.
- The 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 IntensityQ2. Using Mass spectrum and NMR data deduce the structure of the following compounds; (a) CH,BrO, 'H NMR, 3000 MHz, 2.9 ppm (triplet, 2H), and 3.8 ppm (singlet, 3) محناية Relative Abundance (percent) 100 80 60 40+ 20 0 15 27 59 55 87 Scanned with CamScanner 107 135 M (166) 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170The 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.
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- Analysis of a sweet-smelling, neutral compound of carbon, hydrogen and oxygen produced the following results: %C = 54.5; %H = 9.1. From its mass spectrum, the molecular ion had a mass/charge ratio of 88. Its infra-red spectrum showed a prominent peak at 1735 cm–1. Figure below shows the NMR spectrum of the compound. Suggest a structural Formula for this compound.Following is the mass spectrum of an unknown compound. The two highest peaks are at mlz 120 and 122. Suggest a structure for this compound. (Data from http://webbook .nist.gov/chemistry/.) 100 41 80 20 120 122 0 rt 10 20 30 40 60 70 110 140 80 90 m/z 50 100 120 130 150 160 Relative AbundancePredict the relative intensities of the M and M+ 2 peaks for the following. Q) CH3CH2SH