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- What functional groups exist and are missing in this IR spectrum?In each of the following molecules 1-8, identify the relation between the circled hydrogen atoms as homotopic, enantiotopic, diastereotopic, heterotopic?Based on the following IR spectrum, what functional groups may be present in the molecule being observed? Ther are at least two functional groups.
- True or False 1. A molecule that is "IR inactive" means that it does not produce any signal due to no vibration. 2. Infrared spectroscopic data is reported in wavenumber (cm-1) against absorbance because they have a linear relationship. 3. The signals observed from a molecule of chloropropane will have a higher wavenumber than iodopropane. 4. The signals observed from the C-C bond in an alkene will report at a higher wavenumber than the C-C bond in an alkyne.How many asymmetric centres are there in the following molecule? OH HO Me ILL Me Me Please enter your answer as a numeric integer. For example, if your answer is two, input 2True or False 1. A strong signal in infrared spectroscopy indicates that a molecule matches the emitted electromagnetic radiation and reports a high transmittance. 2. Among all the possible vibrational modes, symmetric stretching will be IR inactive. 3. A hygroscopic organic sample to be subjected to IR does not need to be kept dry because water molecules in the air will not affect the IR spectra.
- 10. Label three peaks in the following spectrum with the bond that gives rise to them, and identify the functional group that is present in the compound (the compound has a formula of C5H1002)? 100 Transmittance (%) 88&RSRRRRS. 90 70 3200 2800 2400 2000 1800 Micrometers um 1400 1300 Wavenumber (cm-¹) 1000 800 کہہ 600 400Which atom do you expect is present in this spectrum? 100 Rel. Intensity 80 60 60 40 40 20 20 0.0 0.0 15 30 45 60 75 90 m/z NIST Chemistry WebBook (https://webbook.nist.gov/chemistry) Only hydrocarbons Bromine Chlorine O NitrogenChoose the molecule to which this IR spectrum corresponds.
- 4. Infrared spectroscopic data is reported in wavenumber (cm-!) against absorbance because they have a linear relationship. C True False 5. A hygroscopic organic sample to be subjected to IR does not need to be kept dry because water molecules in the air will not affect the IR spectra. True False 6. The electromagnetic radiation that is emitted in infrared spectroscopy is not enough to excite electrons to an unoccupied molecular orbital. True False 7. A molecule that is "IR inactive" means that it does not produce any signal due to no vibration. True False3. Attached is the IR for one of the compounds you crystallized in this lab. (a) Is this molecule 2- Naphthol, Acetophenone, Aniline or Vanillin? NAME the compound at the bottom of spectrum box. (b) Please identify and assign the major stretching vibrations. 100 Transmittance (%) 50- 4000 3000 1672 7 1666 6 3184 32 3021 50 2975 57 1598 10 2946 67 1690 10 2864 62 1511 10 2848 82 1455 18 2742 70 1464 32 12 1432 13 1398 52 1389 58 1373 66 1300 7 1266 4 1201 23 1500 Wavenumber (cm-¹) 2000 1172 13 1155 6 1125 24 1031 32 960 84 850 42 827 70 814 60 782 70 733 17 633 27 591 55 555 79 549 79 1000 500do they absorb light between 200-400nm?