Which of the following electromagnetic radiation is used in NMR spectroscopy? A) UV B) IR C)...
1. Which of the following electromagnetic radiation is used in NMR spectroscopy?
A) UV
B) IR
C) visible
D) γ-rays
E) radio wave
2. Which of the following is true about the number of signals in a 1 HMMR spectrum?
A) it indicates the number of neighboring protons
B) it indicates the electronic environment of neighboring protons
C) it indicates the number of different kinds of protons
D) it indicates the electronic environment of absorbing protons
E) it indicates the number of protons in the signal
3. Protons Ha and Hb in the following compound are.
A) homotopic
B) enantiotopic
C) diastereotopic
D) mesotopic
E) none of these
4. How many signals would you expect to find in the 'H NMR spectrum of CH₃ OCH₂ CH₂ OCH₃ ?
A) 1
B) 2
C) 3
D) 4
E) 5
Homework Answers
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Which of the following electromagnetic radiation is used in NMR spectroscopy? A) UV B) IR C)...
4. What is the IUPAC name for the following A. (2E, 42)-2,4-hexadiene B. (2E, 4Z)-1,4-dimethyl-1,3-butadiene C....
4. What is the IUPAC name for the following A. (2E, 42)-2,4-hexadiene B. (2E, 4Z)-1,4-dimethyl-1,3-butadiene C. (2z, 42)-1,4-dimethyl-1,3-butadiene D. (22, 42)-2,4-hexadiene E. None of these Predict the product for the following reaction. нгон-1400C 5. A. propene B. diethyl ether C. 1-hexanol D. 1-propoxypropane 6. Which one of the following represents the lowest energy D-bonding molecular orbital of 1,3- butadiene? IV 7. A thermodynamically-controlled reaction will yield: A) the most stable product. B) C) the product that can be formed in...
draw chlorination Mechanism faw Yhe chlorinahion mathenism and the other a ketone, is: A) 13C NMR B) 'H NMR C) Mass spectroscopy D IR spectroscopy E) UV/VIS spectroscopy 23. The last step in t...
draw chlorination Mechanism
faw Yhe chlorinahion mathenism and the other a ketone, is: A) 13C NMR B) 'H NMR C) Mass spectroscopy D IR spectroscopy E) UV/VIS spectroscopy 23. The last step in the chlorination of an aromatic ring is: A) Formation of the Wheland intermediate B) Attack of the benzene ring onto the polarized chlorine molecule C) Lewis acid-Lewis base reaction D) Deprotonation of the Wheland intermediate E) Addition of the chlorine atom to the sp hybridized carbon 24....
2. The protons marked Ha and Hb in the molecule below are: A) chemically equivalent B)...
2.
The protons marked Ha and Hb in the molecule below are:
A) chemically equivalent B) enantitopic C) diastereotopic D)
endotopic E) none of the above
3. Predict the number of signals expected in the 13C NMR
spectrum of the compound shown below.
1, 2, 3, 4, or 8
7.
12.
1. List the most common nuclei that are used in NMR. 2. How many nuclear spin...
1. List the most common nuclei that are used in NMR. 2. How many nuclear spin states are possible for the 1H nucleus? A. 1 B. 2 C. 4 D. 5 E. none of these 3. Which of the following electromagnetic radiation is used in NMR spectroscopy? A. UV B. IR C. visible D. γ-rays E. radio wave 4. _______ protons experience a net magnetic field strength that is smaller than the applied magnetic field. A. Deshielded B. Shielded C. ...
.(23 pts.) Answer the following NMR questions: (a) How many 'H and 10C would ou d...
.(23 pts.) Answer the following NMR questions: (a) How many 'H and 10C would ou d NMR signals would you expect for the compounds shown below7 Show answers in the boxes. 'H signals 13C signals Hsignals 13c signals Hsignal'C signals H signals 13c signals Please indicate the splitting patterns (singlet, doublet, triplet and so on) for the hydrogens in the structures below. (b) (D) Assign the indicated Hs as 'homotopic. "enantiotopic" or diastereotopic" hydrogens 8 (E) Determine the structures of...
Which of the following generally produce signals between 10 - 50 ppm in 13C NMR spectroscopy?...
Which of the following generally produce signals between 10 - 50 ppm in 13C NMR spectroscopy? sp3-hybridized carbon atoms (methyl, methylene, and methine groups) O sp-hybridized carbon atoms as well as sp3-hybridized carbon atoms that are deshielded by electronegative atoms sp2-hybridized carbon atoms O carbon atoms of carbonyl groups Give the number of different kinds of protons the compound that shows the H NMR spectrum shown below: Proton NMR ul ilu 3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4...
Which one of the following atomic spectroscopy method gives the smallest detection limit for ion Flame...
Which one of the following atomic spectroscopy method gives the smallest detection limit for ion Flame absorption b) electrothermal absorption c) flame emission d) ICP torch emission What kinds of spectroscopy instruments currently employ Fourier transform for the most rapid acquisition of a spectrum UV-vis and NMR b) IR and NMR c) NMR and MS d) MS and UV-vis e) IR and AA Which type of mass analyzer is used in the MS analysis of large molecules like proteins True...
b) Consider the proton NMR spectrum of the following ketone: O b H C=C C. d...
b) Consider the proton NMR spectrum of the following ketone: O b H C=C C. d CH H с CH: i) ii) Predict the chemical shifts of each type of proton. Predict the multiplicity of NMR signals for each type of protons. Draw a tree diagram to show the splitting predicted for Hy and indicate the number of lines obtain (given Joc = 15 Hz, Jab = 7 Hz). (7 marks)
practice quiz 1. (3 pts) For each of the following compounds, indicate whether the two protons...
practice quiz
1. (3 pts) For each of the following compounds, indicate whether the two protons shown are homotopic, enantiotopic, or diastereotopic. 2. (8 pts) Indicate the number of signals each of the following compounds would show in their 'Hand C NMR spectra: OME 'H__ _ H__ __ H__ __ H__ "C 3. (10 pts) For each of the following compounds, determine the multiplicity of each signal in the H NMR spectrum: la xiu ood ex gx x x 4....
6. Spectroscopy. The molecular formula of an unknown organic compound is C8H1402. The IR, 1C-NMR and 'H-NMR spectra...
6. Spectroscopy. The molecular formula of an unknown organic compound is C8H1402. The IR, 1C-NMR and 'H-NMR spectra of this compound are shown on the next page. Answer the following questions about this compound. (a) What is the unsaturation number for this compound? (b) What functional group(s) does this compound contain? Indicate the specific evidence for your conclusion. (c) What can you conclude from the number of 13C-NMR signals? (d) What can you conclude from the H-NMR signal at 2.3...
4. What is the IUPAC name for the following A. (2E, 42)-2,4-hexadiene B. (2E, 4Z)-1,4-dimethyl-1,3-butadiene C. (2z, 42)-1,4-dimethyl-1,3-butadiene D. (22, 42)-2,4-hexadiene E. None of these Predict the product for the following reaction. нгон-1400C 5. A. propene B. diethyl ether C. 1-hexanol D. 1-propoxypropane 6. Which one of the following represents the lowest energy D-bonding molecular orbital of 1,3- butadiene? IV 7. A thermodynamically-controlled reaction will yield: A) the most stable product. B) C) the product that can be formed in...
draw chlorination Mechanism
faw Yhe chlorinahion mathenism and the other a ketone, is: A) 13C NMR B) 'H NMR C) Mass spectroscopy D IR spectroscopy E) UV/VIS spectroscopy 23. The last step in the chlorination of an aromatic ring is: A) Formation of the Wheland intermediate B) Attack of the benzene ring onto the polarized chlorine molecule C) Lewis acid-Lewis base reaction D) Deprotonation of the Wheland intermediate E) Addition of the chlorine atom to the sp hybridized carbon 24....
2.
The protons marked Ha and Hb in the molecule below are:
A) chemically equivalent B) enantitopic C) diastereotopic D)
endotopic E) none of the above
3. Predict the number of signals expected in the 13C NMR
spectrum of the compound shown below.
1, 2, 3, 4, or 8
7.
12.
.(23 pts.) Answer the following NMR questions: (a) How many 'H and 10C would ou d NMR signals would you expect for the compounds shown below7 Show answers in the boxes. 'H signals 13C signals Hsignals 13c signals Hsignal'C signals H signals 13c signals Please indicate the splitting patterns (singlet, doublet, triplet and so on) for the hydrogens in the structures below. (b) (D) Assign the indicated Hs as 'homotopic. "enantiotopic" or diastereotopic" hydrogens 8 (E) Determine the structures of...
Which of the following generally produce signals between 10 - 50 ppm in 13C NMR spectroscopy? sp3-hybridized carbon atoms (methyl, methylene, and methine groups) O sp-hybridized carbon atoms as well as sp3-hybridized carbon atoms that are deshielded by electronegative atoms sp2-hybridized carbon atoms O carbon atoms of carbonyl groups Give the number of different kinds of protons the compound that shows the H NMR spectrum shown below: Proton NMR ul ilu 3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4...
b) Consider the proton NMR spectrum of the following ketone: O b H C=C C. d CH H с CH: i) ii) Predict the chemical shifts of each type of proton. Predict the multiplicity of NMR signals for each type of protons. Draw a tree diagram to show the splitting predicted for Hy and indicate the number of lines obtain (given Joc = 15 Hz, Jab = 7 Hz). (7 marks)
practice quiz
1. (3 pts) For each of the following compounds, indicate whether the two protons shown are homotopic, enantiotopic, or diastereotopic. 2. (8 pts) Indicate the number of signals each of the following compounds would show in their 'Hand C NMR spectra: OME 'H__ _ H__ __ H__ __ H__ "C 3. (10 pts) For each of the following compounds, determine the multiplicity of each signal in the H NMR spectrum: la xiu ood ex gx x x 4....
6. Spectroscopy. The molecular formula of an unknown organic compound is C8H1402. The IR, 1C-NMR and 'H-NMR spectra of this compound are shown on the next page. Answer the following questions about this compound. (a) What is the unsaturation number for this compound? (b) What functional group(s) does this compound contain? Indicate the specific evidence for your conclusion. (c) What can you conclude from the number of 13C-NMR signals? (d) What can you conclude from the H-NMR signal at 2.3...
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