Homework Answers
Answer:- The first NMR spectrum is of methyl benzoate ( C6H5COOCH3). Second NMR spectrum is of phenyl ethanoate CH3COOC6H5. This is because in the spectrum, peak due to methyl group (-CH3) is around 3.9 ppm which clearly indicates that -CH3 group is adjacent to more electronegative 'O' atom. If the -CH3 group is adjacent to -C=O group ( less electronegative) then its peak comes around 2.3 ppm.
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2. Match the following isomers Somers with the IH NMR spectrum shown below? Explain your answer....
Part B The H NMR spectrum shown here is given by constitutional isomers of propylamine (C3H9N)....
Part B The H NMR spectrum shown here is given by constitutional isomers of propylamine (C3H9N). Identify the isomer that gives the following spectrum. An H1 NMR spectrum of the constitutional isomers of propylamine 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. You do not need to show hydrogen atoms connected to carbon atoms. Include hydrogen atoms connected to nitrogen atoms.
7. Which of the molecules below gives the following 'H NMR spectrum? Explain your answer. 3H...
7. Which of the molecules below gives the following 'H NMR spectrum? Explain your answer. 3H 2H 3H 4.0 3.5 3.0 2.5 1.5 1.0 PPM 0.5 5.6 a) b) d) JOHN OH 8. Which of the below given molecules gives the following MS spectrum? Explain your answer. 100 3D (100%) 16 1725 80.- 60.- Rol Abundance 40.- 20.- (NEVES ( 88) 10 1. INZE 15 (19) 0 10 20 30 40 50 80 miz a) CH3C1 b) CHF c) CH2Cl2...
(a) Explain how you would distinguish the three isomers below using NMR spectroscopy
(a) Explain how you would distinguish the three isomers below using NMR spectroscopy. Give specific examples of peaks, chemical shifts and splitting patterns that would illustrate the differences (b) Determine the structure of C8H14O from the NMR data below. (c) Draw the 1H-NMR spectrum you would expect for the following compounds. Show clearly the splitting pattern and the integration values.
5. Which of the molecule below gives the following 13C NMR spectrum? Explain your answer 200...
5. Which of the molecule below gives the following 13C NMR spectrum? Explain your answer 200 300 BO 40 b) d) CHLECH.CH.CH, O -CH:CH-CH:CH HC HC CH.CH CH3CCH CH.CH 6. Which underlined hydrogen atom is the most deshielded? CHCH-CH3 (1) CH3OCHCH: (1) CICH:CH-CH3
Below is the 300 MHz 'H NMR (in CDCl3) of one of the six isomers of...
Below is the 300 MHz 'H NMR (in CDCl3) of one of the six isomers of dimethylphenol. Match the spectrum to the appropriate isomer. Label protons as Hi, H2, H3, etc. in the compound and assign the resonances of the spectrum to the appropriate protons. Identity of the isomer: _3,5 - dimethylphenol. 8 5 2 Draw a splitting tree for each of the aromatic protons and estimate the J values.
Please write neatly. 6. Below are seven spectra: 2 x 11-NMR. 3 x 1·1x C-NMR, and 1 x MS, m hat order. At the bottom of the page there are seven structures, Match each structure with a spectrum by...
Please write neatly.
6. Below are seven spectra: 2 x 11-NMR. 3 x 1·1x C-NMR, and 1 x MS, m hat order. At the bottom of the page there are seven structures, Match each structure with a spectrum by writing the letter for the structure in the box on the correct spectrum. Fach structure and spectrum should be used only once HC-CH2-C CH3 OH 6 NH2 CH
6. Below are seven spectra: 2 x 11-NMR. 3 x 1·1x C-NMR, and...
Match the following 1H NMR spectrum with one of the given compounds. Match signals to the...
Match the following 1H NMR spectrum with one of the given
compounds. Match signals to the protons on the structure.
3. (5 points) From the NMR spectrum below, determine the structure of the compound. The molecular...
3. (5 points) From the NMR spectrum below, determine the structure of the compound. The molecular formula is C_HBrO2. There are no IH NMR signals outside of the region shown. 4.0 3.0
Shown above is the 1H-NMR spectrum of a compound with the formula C5H10O2 . Choose from...
Shown above is the 1H-NMR spectrum of a compound with
the formula C5H10O2 . Choose from the constitutional isomers below
to assign a structure to this spectrum.
3H 2H 3H 2H PPM Shown above is the 'H-NMR spectrum of a compound with the formula C5Hi002. Choose from the constitutional isomers below to assign a structure to this spectrum a b C CH3CH2CH2CH2COH CH3CH2COCH2CH3 CH3CH2CH2COCH3 (Choose the letter corresponding to the correct structure from the drop-down list provided.) Correct Structure: Assign...
circle the most stable of the two isomers shown below. explain your answer in two or fewer sentences 1. Circle the...
circle the most stable of the two isomers shown below. explain
your answer in two or fewer sentences
1. Circle the most stable of the two isomers shown below. Explain your answer in two or fewer sentences (1 pt). .
Part B The H NMR spectrum shown here is given by constitutional isomers of propylamine (C3H9N). Identify the isomer that gives the following spectrum. An H1 NMR spectrum of the constitutional isomers of propylamine 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. You do not need to show hydrogen atoms connected to carbon atoms. Include hydrogen atoms connected to nitrogen atoms.
7. Which of the molecules below gives the following 'H NMR spectrum? Explain your answer. 3H 2H 3H 4.0 3.5 3.0 2.5 1.5 1.0 PPM 0.5 5.6 a) b) d) JOHN OH 8. Which of the below given molecules gives the following MS spectrum? Explain your answer. 100 3D (100%) 16 1725 80.- 60.- Rol Abundance 40.- 20.- (NEVES ( 88) 10 1. INZE 15 (19) 0 10 20 30 40 50 80 miz a) CH3C1 b) CHF c) CH2Cl2...
5. Which of the molecule below gives the following 13C NMR spectrum? Explain your answer 200 300 BO 40 b) d) CHLECH.CH.CH, O -CH:CH-CH:CH HC HC CH.CH CH3CCH CH.CH 6. Which underlined hydrogen atom is the most deshielded? CHCH-CH3 (1) CH3OCHCH: (1) CICH:CH-CH3
Below is the 300 MHz 'H NMR (in CDCl3) of one of the six isomers of dimethylphenol. Match the spectrum to the appropriate isomer. Label protons as Hi, H2, H3, etc. in the compound and assign the resonances of the spectrum to the appropriate protons. Identity of the isomer: _3,5 - dimethylphenol. 8 5 2 Draw a splitting tree for each of the aromatic protons and estimate the J values.
Please write neatly.
6. Below are seven spectra: 2 x 11-NMR. 3 x 1·1x C-NMR, and 1 x MS, m hat order. At the bottom of the page there are seven structures, Match each structure with a spectrum by writing the letter for the structure in the box on the correct spectrum. Fach structure and spectrum should be used only once HC-CH2-C CH3 OH 6 NH2 CH
6. Below are seven spectra: 2 x 11-NMR. 3 x 1·1x C-NMR, and...
Match the following 1H NMR spectrum with one of the given
compounds. Match signals to the protons on the structure.
3. (5 points) From the NMR spectrum below, determine the structure of the compound. The molecular formula is C_HBrO2. There are no IH NMR signals outside of the region shown. 4.0 3.0
Shown above is the 1H-NMR spectrum of a compound with
the formula C5H10O2 . Choose from the constitutional isomers below
to assign a structure to this spectrum.
3H 2H 3H 2H PPM Shown above is the 'H-NMR spectrum of a compound with the formula C5Hi002. Choose from the constitutional isomers below to assign a structure to this spectrum a b C CH3CH2CH2CH2COH CH3CH2COCH2CH3 CH3CH2CH2COCH3 (Choose the letter corresponding to the correct structure from the drop-down list provided.) Correct Structure: Assign...
circle the most stable of the two isomers shown below. explain
your answer in two or fewer sentences
1. Circle the most stable of the two isomers shown below. Explain your answer in two or fewer sentences (1 pt). .
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