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QUESTION 7 How many magnetically different protons are in the following compound? CH3 H3c CH2 7...
QUESTION 9 Why does a proton NMR spectrum of the NMR solvent CDCl3 show a signal...
QUESTION 9 Why does a proton NMR spectrum of the NMR solvent CDCl3 show a signal at 7.26 ppm even if the CDC13 molecule contains no hydrogen? NMR solvent CDC13 contains some unknown impurity, which shows signal at 7.26 ppm. NMR solvent CDC13 contains very small % of CHCl3 impurity, which shows signal at 7.26 ppm. NMR solvent CDC13 has one deuterium, which is an isotope of hydrogen. That shows signal at 7.26 ppm. NMR solvent CDC13 has one carbon,...
How many magnetically different protons are in the following compound? CH3 H3C CH2 7 9 10...
How many magnetically different protons are in the following compound? CH3 H3C CH2 7 9 10
50. For the following compound how many different signals would you see in the proton NMR?...
50. For the following compound how many different signals would you see in the proton NMR? (Assume that you can see them all.) A) 4 B) 5 C) 6 D) 7 E) 8 . An organic compound absorbs strongly in the IR at 1687 em. Its 'H NMR spectrum consists of two signals, a singlet at 2.1 ppm and a multiplet centered at 7.1 ppm. Its mass spectrum shows significant peaks at m/z 120, m/z 105 and m/z 77. This...
Organic Lab Technique Problem Set 1) How many different sets of equivalent protons are there in...
Organic Lab Technique Problem Set 1) How many different sets of equivalent protons are there in the following compound? CI CH3CCH2C(CH3)3 CH3 5. Which or the spect A. three B. four C. five D. six 2) Which of the following gives the furthest downfield shift from TMS in its proton NMR spectrum? A. CC14 B. CHCl3 C. CH2C12 D. CH3CI 3) Which of the following has only a single peak in its proton NMR spectrum? I. (CH3)3CCI II. (CH3)2C=C(CH3)2 H,C...
7. Which compound below best fits the following spectral data? 8. How many signals would you...
7. Which compound below best fits the following
spectral data?
8. How many signals would you expect to see in the
broadband decoupled C^13 spectra of the following compounds?
9. If a proton gave an NMR signal at 3.2 ppm on a MHz
NMR, what would the chemical shift be of this proton (in ppm) if
the sample was run in 400 MHz NMR?
7. Which compound below best fits the following spectral data? (6 points) H-1 NMR 0.9 ppm...
QUESTION 3 If a CH3 proton appears in NMR spectroscopy at 1.2 kHz in a 600...
QUESTION 3 If a CH3 proton appears in NMR spectroscopy at 1.2 kHz in a 600 MHz instrument, where would this signal appear in parts per million (ppm) scale? 0.002 ppm 0.5 ppm 2 ppm 5 ppm QUESTION 5 Predict the NMR spectrum of the following compound: на H2 Hз -NO2 H1 no H1 H2 H3 Hj shows triplet near 1.0 ppm, H2 shows multiplet near 2.0 ppm, H3 shows triplet near 4.5 ppm Hy shows triplet near 1.0 ppm,...
Question 5: (11 marks) Compound B, which contains only carbon, hydrogen and oxygen atoms, shows the...
Question 5: (11 marks) Compound B, which contains only carbon, hydrogen and oxygen atoms, shows the mass, IR, H NMR and C NMR spectra given below a) With brief explanation, deduce the structure of Compound B b) Explain the mass spectroscopic signals at m/z 122, 105 and 77. Mass Spectrum 122 M° 150 70 90 100 110 120 130 140 150 150 170 180 100 200 mve Infrared Spectrum Wave Number,cm- 4000 3000 250 2000150 13 1 11001000900 80 Wavelengihn,...
Organic Lab Techni F 1) How many different sets of equivalent protons are there in the...
Organic Lab Techni F 1) How many different sets of equivalent protons are there in the following compound? CI CH3CCH2C(CH3)3 CH3 A. three B. four C. five D. six 2) Which of the following gives the furthest downfield shift from TMS in its proton NMR spectrum? A. CCI4 B. CHCI3 C. CH2Cl2 D. CH3CI 3) Which of the following has only a single peak in its proton NMR spectrum? H C C H3C CH3 A. only I B. only II...
The H-NMR spectrum of an unknown compound (formula CaHgO2) is shown below. Draw the structure of...
The H-NMR spectrum of an unknown compound (formula CaHgO2) is shown below. Draw the structure of the unknown compound. Question 5 4 1 6 5 8 10 11 Ppm The 13C-NMR spectrum of an unknown compound (formula CgH180) is shown below. Its 1H-NMR spectrum only shows one singlet at 1.2 ppm. Draw the structure of this unknown compound. uestion 2 220 200 160 140 120 PPM 100 80 240 180 60 40 20 Create OscerSketch Answer 2 What would be...
Question 2 The 13 C-NMR spectrum of an unknown compound (formula CgH180) is shown below. Its...
Question 2 The 13 C-NMR spectrum of an unknown compound (formula CgH180) is shown below. Its "H-NMR spectrum only shows one singlet at 1.2 ppm. Draw the structure of this unknown compound. 240 220 '200'180' 160140120100' 80' 604020 PPM H3CU CH3 CH3 CH3 Create OscerSketch Answer 2 Incorrect: Answer has an incorrect structure. What would be the expected splitting pattern of the signal associated with the indicated hydrogen atoms? Question 3 A. singlet B. doublet C. triplet D. quartet E....
QUESTION 9 Why does a proton NMR spectrum of the NMR solvent CDCl3 show a signal at 7.26 ppm even if the CDC13 molecule contains no hydrogen? NMR solvent CDC13 contains some unknown impurity, which shows signal at 7.26 ppm. NMR solvent CDC13 contains very small % of CHCl3 impurity, which shows signal at 7.26 ppm. NMR solvent CDC13 has one deuterium, which is an isotope of hydrogen. That shows signal at 7.26 ppm. NMR solvent CDC13 has one carbon,...
How many magnetically different protons are in the following compound? CH3 H3C CH2 7 9 10
50. For the following compound how many different signals would you see in the proton NMR? (Assume that you can see them all.) A) 4 B) 5 C) 6 D) 7 E) 8 . An organic compound absorbs strongly in the IR at 1687 em. Its 'H NMR spectrum consists of two signals, a singlet at 2.1 ppm and a multiplet centered at 7.1 ppm. Its mass spectrum shows significant peaks at m/z 120, m/z 105 and m/z 77. This...
Organic Lab Technique Problem Set 1) How many different sets of equivalent protons are there in the following compound? CI CH3CCH2C(CH3)3 CH3 5. Which or the spect A. three B. four C. five D. six 2) Which of the following gives the furthest downfield shift from TMS in its proton NMR spectrum? A. CC14 B. CHCl3 C. CH2C12 D. CH3CI 3) Which of the following has only a single peak in its proton NMR spectrum? I. (CH3)3CCI II. (CH3)2C=C(CH3)2 H,C...
7. Which compound below best fits the following
spectral data?
8. How many signals would you expect to see in the
broadband decoupled C^13 spectra of the following compounds?
9. If a proton gave an NMR signal at 3.2 ppm on a MHz
NMR, what would the chemical shift be of this proton (in ppm) if
the sample was run in 400 MHz NMR?
7. Which compound below best fits the following spectral data? (6 points) H-1 NMR 0.9 ppm...
QUESTION 3 If a CH3 proton appears in NMR spectroscopy at 1.2 kHz in a 600 MHz instrument, where would this signal appear in parts per million (ppm) scale? 0.002 ppm 0.5 ppm 2 ppm 5 ppm QUESTION 5 Predict the NMR spectrum of the following compound: на H2 Hз -NO2 H1 no H1 H2 H3 Hj shows triplet near 1.0 ppm, H2 shows multiplet near 2.0 ppm, H3 shows triplet near 4.5 ppm Hy shows triplet near 1.0 ppm,...
Question 5: (11 marks) Compound B, which contains only carbon, hydrogen and oxygen atoms, shows the mass, IR, H NMR and C NMR spectra given below a) With brief explanation, deduce the structure of Compound B b) Explain the mass spectroscopic signals at m/z 122, 105 and 77. Mass Spectrum 122 M° 150 70 90 100 110 120 130 140 150 150 170 180 100 200 mve Infrared Spectrum Wave Number,cm- 4000 3000 250 2000150 13 1 11001000900 80 Wavelengihn,...
Organic Lab Techni F 1) How many different sets of equivalent protons are there in the following compound? CI CH3CCH2C(CH3)3 CH3 A. three B. four C. five D. six 2) Which of the following gives the furthest downfield shift from TMS in its proton NMR spectrum? A. CCI4 B. CHCI3 C. CH2Cl2 D. CH3CI 3) Which of the following has only a single peak in its proton NMR spectrum? H C C H3C CH3 A. only I B. only II...
The H-NMR spectrum of an unknown compound (formula CaHgO2) is shown below. Draw the structure of the unknown compound. Question 5 4 1 6 5 8 10 11 Ppm The 13C-NMR spectrum of an unknown compound (formula CgH180) is shown below. Its 1H-NMR spectrum only shows one singlet at 1.2 ppm. Draw the structure of this unknown compound. uestion 2 220 200 160 140 120 PPM 100 80 240 180 60 40 20 Create OscerSketch Answer 2 What would be...
Question 2 The 13 C-NMR spectrum of an unknown compound (formula CgH180) is shown below. Its "H-NMR spectrum only shows one singlet at 1.2 ppm. Draw the structure of this unknown compound. 240 220 '200'180' 160140120100' 80' 604020 PPM H3CU CH3 CH3 CH3 Create OscerSketch Answer 2 Incorrect: Answer has an incorrect structure. What would be the expected splitting pattern of the signal associated with the indicated hydrogen atoms? Question 3 A. singlet B. doublet C. triplet D. quartet E....
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