Identify the hydrocarbon that has molecular ion with an m/z value of 128, a base peak with an m/z value of 43, and significant peaks with m/z values of 57, 71, and 85. Draw the molecule on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars. The single bond is active by default.
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- у Give the major peak that would be present in the functional group re following compounds: 2800 OH OH 2700 hydovcoad a ing row X XAssign as many resonances as you can to specific carbon atoms in the 13C NMR spectrum of ethyl benzoate.Which one of these four compounds would give a 13C NMR spectrum with only these three peaks, one at 210, one at 40 and one at 20? H3C OB OD 13C NMR delta (8) values C=O of ketones, aldehydes C=O of acids, esters, amides C=C and C=N C-X (where X = halogen, O) base position, alkyl C OC A OA CH3 H3C B CH3 H3C1 220-200 160-180 100-150 40-70 0 - 40 CH3 H₂C D CH3
- Propose a structure for the following NMR spectra of a compound with chemical formula C8H9BR. Draw your final structure in the box. Assign all peaks to atoms in your structure. Chem. shift Rel. area 1.20 3.00 2.58 2.00 7.07 2.00 7.39 2.00 TMS 10 9. 8. 7 6. 4 1 0 ppm Chemical shift (8) TMS 80 60 40 0 ppm 160 140 120 100 200 180 Chemical shift (8) 20 2. 3.4- How many proton signals appear in the 1H NMR spectrum of vinyl chloride? a) three signs b) two signs c) four signs 5- A compound with the general formula CHO showing one single signal in the NMR spectrum. The compound is: - a) 2--propanone b) cyclo propanol c) propanal| 6- a) m/e 66 b) m/e= 68 c) m/e= 69 The following compound is given by mass spectrometry, M.wt = 108, its peak at ....The mass spectrum for acetophenone is shown below. a) Where does the molecular ion show up? ?) b) Which peak is the base peak? ? 1) The mass spectrum for acetophenone is shown below. Relative Intensity 100- 80- 20- acetophenone 0-tyttim 20 10 30 40 50 60 77 trommlilily 70 m/z 80 90 100 105 Ć 110 120 120 a) Where does the molecular ion show up? (m/z = ?) b) Which peak is the base peak? (m/z = ?) c) Draw the structure of the charged species responsible for the peak at m/z = 120. d) Draw the structure of the charged species responsible for the peak at m/z = 105. e) Draw the structure of the charged species responsible for the peak at m/z = 77.
- the electron ionization mass spectrum of a small neutral molecule shows a base peak at 27 and a smaller peak at 26 with a relative abundance of 20%. Deduce the structure of the unknown compound. Step 3: if the molecular ion is odd or even, this indicates the number of nitrogens. The mass spec data shows an ____ (odd or even) molecualr weight.The base peak appears at m/z 83 for one of the following compounds and at m/z 97 for the other two. Match the m/z values for the base peaks with the appropriate compounds. compound xx m/z (Choose one) 97 83 (Choose one) (Choose one) X Ś 8 E olo 18 ArWhich structure of molecular formula, C4H8C12, fits the proton NMR spectrum shown below? 11 10 8 5 3 ppm HSP-00-228 CI CI CI .CI CI O CI, CI
- The mass spectrum of an aldehyde shows a parent peak at m/z = 58 and a base peak at m/z = 29. Propose a structure, and identify the two species whose m/z values were listed. Name the compound in the box below.The base peak appears at m/z 83 for one of the following compounds and at m/z 97 for the other two. Match the m/z values for the base peaks with the appropriate compounds. compound xx 97 83 97 m/z XThe proton ¹H (Hydrogen) NMR of a compound, C7H7CI, has the following peaks. Which compound below best fits the data? 10 9 HPM-01-022 2H Doublet 8 7 2H Doublet 6 5 ppm 4 3H Singlet 3 2 1 0