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Why is the answer 6? Are the 2 protons on the nitrogen in different environments?
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- Consider the ¹H NMR spectrum of the following compound, and rank the signals in terms of increasing chemical shift. Identify the proton(s) giving rise to each signal: Cl H OHWhat do the peaks of the C-NMR of C9H12 mean?Which of the protons in the following molecule has the highest chemical shift H3C-O-CH₂-CH₂-C-H 11 i in the 1H NMR spectrum? O ii iv Oi iv
- How many signal(s) will appear in the H-NMR spectrum of acetone (structure shown below)? 4 O 17:511 l 5GE O Unanswered • 2 attempts left Which of the following compounds would display 4 different signals (two doublets, a singlet, and a triplet) in its 'H-NMR? A A В В C C D E NO2 NO2 NO2 NO2 NO2 CF3 CF3 NO2 CF3 NO2Which 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
- How many 1H NMR signals would expect for the following molecule? OH 10 08 5 09 07For the following compound how many different signals would you see in the carbon NMR? (Assume that you can see them all.) 4 O 8 071Compound 1 has molecular formula C7H16. It shows three signals in the 1H-NMR spectrum, one at 0.85 ppm, one at 1.02 ppm, and one at 1.62 ppm. The relative integrals of these three signals are 6, 1, and 1, respectively. Compound 2 has molecular formula C7H14. It shows three signals in the 1H-NMR spectrum, one at 0.98 ppm, one at 1.36 ppm, and one at 1.55 ppm. The relative integrals of these three signals are 3, 2, and 2, respectively. Propose structures for compounds 1 and 2, explaining how you reach your conclusion.
- 4) Draw the compound with molecular formula C9H100 that produces the following signals. Show your work by labeling your structure (Ha, Hb, etc.): 1H NMR a) 9.8 ppm, singlet, 1 H b) 7.3-7.6 ppm, multiplet (overlapping signals), 5 H c) 3.2 ppm, triplet, 2 H d) 2.8 ppm, triplet, 2H 13C NMR: 201.5, 140.7, 128.6, 128.5, 126.4, 45.2, 25.1 ppm4- 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 ....Compound 1 has molecular formula C6H12. It shows three signals in the 1H-NMR spectrum, one at 0.96 ppm, one at 2.03 ppm, and one at 5.33 ppm. The relative integrals of these three signals are 3, 2, and 1, respectively. Compound 2 has molecular formula C7H15Br. It shows two signals in the 1H-NMR spectrum, one at 1.08 ppm and one at 1.59 ppm. The relative integrals of these two signals are 3 and 2, respectively. Propose structures for compounds 1 and 2, explaining how you reach your conclusion.