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- 8. a) Use the mass spectrum to determine the identity of the halogen atom (X) in the following molecular formula. 100 - C3H5XO2 80- 60 40 20- 152 154 20 40 60 80 100 120 140 160 180 200 m/z Relative IntensityConsider the mass spectrum below. 100 80- 60- 20 0.0- 0.0 60 100 miz SDBS, National Institute of Advanced Industrial Science and Technology Which peak is the molecular ion? Choose one OA OB OD. OG#9. Use the information provided below to find out the molecular formula and structure of the compound. QE-300 CDCl3 al Relative Intensity 100 80 60 40 20 +0 0-min 10 3454 #1 3456 57 2907 15 2944 20 2910 36 2879 50 TO ALLE 1 In 20 30 2716 81 2001 04 2438 1 2154 84 1991 84 1972 77 1733 4 1476 23 1470 25 1447 19 1421 16 1116 25 1160 9 40 50 1306 1270 1140 1022 9 974 27 657 25 76466 6 $ 60 m/z MENYERL 70 722 27 608 13 1900 80 90 100 110 120
- Ater analyzing a mass spectrum you conclude that the molecule being analyzed has the molecular formula C4H8; however, there are five possible constitutional isomers with that same molecular formula. the only thing that stands out in the mass spectrum is a strong fragment signal at m/z=41. Determine the possible constitutional isomers for C4H8 and explain which isomer matches the mass spectrum.2. The mass spectrum of a hydrocarbon is shown below. Use the Rule of 13 to determine a molecular formula and use the formula to calculate units of unsaturation. Assume that the peak at m/z 120 is the molecular ion. What are possible structures for this compound? 100 80 60- 40 20 10 20 30 40 50 60 70 80 90 100 110 120 m/z Relative IntensityRelative intensity 2) Solve the molecular formula for the mass spectrum below. a. Propose a possible structure (there are multiple possible answers). b. Propose a structure for the fragments at m/z 119 and 105. 100 80 60 40 20 0 10 20 30 40 سل السلسال 50 60 70 80 m/z 90 134 I 120 130 140 150 Lule LwL 100 110 1
- 1. Which one of the given compounds is consistent with the mass spectrum below? 100 40 20 10 20 25 30 35 40 5o 55 45 60 65 70 75 m/z Courtesy of SDBS: National Institute of Advanced Industrial Science and Technology A. CH,CH,CH(CH,), В. CH,CHOHCH,CH, C. CH,CH,OCH,CH, D. CH,CH,NHCH,CH, E. CH,CH,CH,CH, Relative htensityIn the mass spectra below, determine the Base Peak, the molecular ion peak and indicate the fragmentation process of ions marked with their respective value. 100 Mass Spectrum 57 80 29 60 87 40 101 M** 73 20 130 Cg H180 40 80 120 160 200 240 280 m/e yeed eseq p %The IR spectrum below belongs to an organic compound A having one nitrogen atom. Determine which structures that fits to the IR spectrum. Justify your answer by providing two (2) IR absorption peaks with their wavenumber. CN NH2 Ahsorbance / 4 50 100- 4000 3000 2500 2000 1500 1000 500 Wavenumbers / cm
- What functional group is indicated by the arrow? Percent Transmission (Transmitance) 0.8 0.6 0.4 0.2 amine. 2000 Wavenumber (cm-1) NIST Chemistry WebBook (https://webbook.nist.gov/chemistry) nitrile alkyne Ketone 3000 alcoholi Acetone INFRARED SPECTRUM M 100019. Explain the peaks in the following mass spectra: a. 2-pentanone: m/e 86, 71, 57, 43 (100 %) b. 1,2-dichloroethane: m/e 100, 98, 64, 62 (100 %), 51, 49, 27 c. Bromocyclohexane: m/e 163, 161 (both very small), 83 (100 %), 55, 41.In the mass spectra below, determine the Base Peak, the molecular ion peak and indicate the fragmentation process of ions marked with their respective value. 100 Mass Spectrum CH3 105 80 60 40 M 134 20 C3H100 40 80 120 160 200 240 280 m/e 100- 80 91 Mass Spectrum 60 134 40 20 149 C10 H15N 40 80 120 160 m/e 200 240 280 % of bese peak % of base peak