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- For the following reaction, choose a statement that best describes differences in the FTIR spectra of the starting reagent and product. :0 1) CH3MgBr 2) H3O+ ? O The absorbance at 3500-3200 cm-1 will decrease and a new absorbance at 1730 cm-1 will increase. O The absorbances at 1730 cm-1 and 3500-3200 cm-1 will decrease. O The absorbances at 1730 cm-1 and 3500-3200 cm-1 will increase. O The absorbance at 1730 cm-1 will decrease and a new absorbance at 3500-3200 cm-1 will increase.The following two mass spectra represent 1-bromo-4-ethylbenzene and (1-bromoethyl)benzene, respectively. 100 - MS-IU-9451 Spectrum 1 80 - 60 40 20 - 25 50 75 100 125 150 175 m/z 100 - MS-NU-8350 Spectrum 2 80 - 60 20- 20 40 60 80 100 120 140 160 180 200 m/z 1. Assign each spectrum to one compound 2. Justify your assignment by assigning relevant signals in each spectrum. 3. Explain how you could determine which spectrum belongs to which compound. Relative Intensity Relative IntensityWhat can you tell about the characteristic peaks of the following spectra? 100 4B00 3000 2000 1500 1000 NAVENUMB ERI - TPANSHETTRNCEI&I
- 3. The EI spectrum of ethyl 2-methylbenzoate is given below. Assign structures to all of the labeled species and rationalize their formation. 100 Ethyl 2-methylbenzoate El MW = 164 119 CH3 80 60 118 164 91 40 135 20니 0 tm 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 m/z Intensity1. Given the IR and MS spectra, identify the following unknown with molecular formula (C5H10). 0.9 0.75 0.6 0.45 3089 2975 3000. 1648 2000. WAVENUMBER (cm-1) 885 1000. 100.- 80. 60.- 40.- 20. 0. 0. 15 15. d. Propose a structure consistent with this information. 29 c. To what do MS fragments at m/z = 70, 55, and 29 correspond? 30. m/z a. Calculate the hydrogen deficiency index for the molecule (show your work). 45. b. To what do the IR absorptions at 3089, 2975, 1648, and 885 cm³¹ correspond? 60. 70 75.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 CH,CHO-C- -NH2 120 40 92 20 137 C3H1NO2 80 120 160 m/e 40 200 240 280 100 Mass Spectrum Br 91 80 60 40 20 M** 198/200 C3H1,Br 40 80 120 160 200 240 280 m/e % of base peak yed eseg jO
- 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 peak4. For the following reaction, which of the following is consistent with the IR spectrum of the product? henzaphenone M. Mass 182.22 mp 48°C NaBH4 CH3OH H OH o benzhydrol M. Mass 184.24 mp 65-67 °C A) Broad peak at 3400 cm-¹ should disappear B) Broad peak at 3400 cm³¹ and 1720cm-¹ should appear C) Broad peak at 3400 cm³¹ should disappear, new absorption at 1720 cm-¹ should appear. D) absorption at 1720 cm-¹ should disappear and Broad peak around 3400 cm-¹ should appear.The following Infra-Red Spectrum is that of an unknown organic compound. Infrared Spectrum 1.0 0.8 0.6 0.4 0.2 0.0 3500 3000 2500 2000 1500 1000 500 Wavenumbers (cm-1) The compound could be: butan-2-one а. b. methyl ethanoate c. propanoic acid d. ethanol Transmitance
- 7. Propose a structure for the alkene having the mass spectrum shown below. Assume that there are no double bond rearrangements occurring. M+ is at 84, major fragments at 69, 43, 41. Identify the major fragmentations/fragments using a proposed structure.. MASS SPECTRUM 100 80 60 40 20 0.0+ 0.0 20 40 60 80 100 m/z Rel. IntensityIn the mass spectra below, determine the Base Peak, the molecular ion peak and indicate the fragmentation process of ions marked with their respective value. 100 121 Mass Spectrum H. 80 NO2 60 40 104 20 M+ 151 1% C,H;NO3 40 80 120 160 200 240 280 m/e 100 Mass Spectrum H-C OCH3 80 M*= 136 60 40 92 107 20 C3H3O2 40 80 120 160 200 240 280 m/e % of base peak % of base peak O=0Identify the following in the given IR Mass spectrum. Compound 1 Mass Spectroscopy: Interpretation of peaks: Compound 1 Mass Spectroscopy: MASS SPECTRUM 100 80 60 40 20 0.0- 10 20 30 40 50 60 70 m/z Interpretation of peaks: Rel. Intensity