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- 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+=123.0320Which C8H10 compound gives the following 1H NMR spectrum? A. 2 B. 3 C. 1 D. 4Which of the following molecules produced the 1H NMR spectrum shown below? (key: s = singlet, d = doublet, t = triplet, q = quartet, sept = septet, dd = doublet of doublets, br = broad singlet, m = multiplet) 2H, q 1H, q Cil 1H, br PPM 8 A. B. C. D. 2H, d 2H, d MeO 7 6 OH OH 3H, d 2 3H, t
- Determine the molecular structure of the compound in the IR spectrum data, 1H NMR ; 13C NMR and MS, explain it for each picture.Which of the following would not theoretically be seen in the splitting patterns for the 1Hb NMR signals for the following molecule if Jab < Jbc . CH; „Hb H;aC `CH2c-Br A. type b splits type a into a doublet B. type b splits type c into a doublet O C. type a splits type b into a septet then type c splits those into triplets O D. type c splits type b into a triplet then type a splits those into septets7. Which of the molecules below correspond to which of the 'H NMR spectra? Explain your choice. Note that in both spectra below, the peaks are singlets of 3H or 9H. FUX 18 # 3H A Denting 3 10 9 8 7 6 5 4 OCH 3 4 +2 9H 1 1 B J 3H Cada 3 2 7 6 5 4 10 9 8 7 9H 1
- 1B. Can 1H NMR spectroscopy be used to differentiate between the two compounds? Briefly explain why or why not. Predict the 1H NMR spectrum for each compound (include integration, multiplicity, and approximate chemical shift). Put it in data table format.Connections to biology 5. Tyrosine is an important amino acid in Biochemistry. Assign the peaks in the ¹H-NMR to the hydrogens in the structure of tyrosine by placing a, b, c, and d in the appropriate corresponding boxes. The hydrogen atoms attached to O and N atoms do not need to be labeled on this spectrum. b 14 12 10 d HN C NH₂ histidine PPM OH12. The 'H-NMR spectra of three isomers with the formula C4H9BR are shown below. Which isomer produces each spectrum? 1.1 10 09 PM 6 8 (ppm) frequency 2 6. 4 8 (ppm) frequency na 8 7 4 ô (ppm) frequency
- Chemistry what is it the reang of 1HNMR and 13C NMR spectra for this compound?Can you explain spectroscopy? Let's start with NMR Spectroscopy. What is the difference between a proton being enantiotopic and homotopic? What does it mean for a proton to be shielded or deshielded? How do you determine J (the coupling constant)? What does 'coupling is mutual' mean? How is that translated on the NMS Spectroscopy spectrum? Does that have to do with the polarity of the molecule? Is there an easier way to explain that? When thinking about C-13 NRM Spectroscopy, what it meant by the statement, "the carbons cannot integrate"? When looking at an NMR Spectroscopy spectrum, how do you know which peak belongs to which proton? (The intensity of the peak and the ppm of the peak) P.S. These questions come from after watching a lecture. There is no graded assignment attached to these questions. I simply do not understand the material.14) The intensity of a signal in a ¹H NMR spectrum is determined by A. The number of neighboring C. Number of enantiotopic B. The electronic environment of D. Number of equivalent E. Number of non-equivalent protons.