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Problem 2: (5 points each) Draw the most likely structure of th Points each) Draw the...
OK, now to look at the fragments. This is the most difficult aspect of interpreting MS...
OK, now to look at the fragments. This is the most difficult aspect of interpreting MS data, and fortunately you often don't need to do this yourself (let a computer do it!) Consider this spectrum which is for a molecule of formula C3H1.0.(M) - 86. Relative Abundance T 20 0 10 ill 30 40 50 60 70 80 90 m/z This molecule is an aldehyde or ketone with a formula of CsH100. Draw all isomers of this formula that have...
6. Characterization and Synthesis (20 points total) Use the information provided below and the IR and...
6. Characterization and Synthesis (20 points total) Use the information provided below and the IR and NMR spectra on the next page to answer the following questions. a) An MS was taken of molecule A and the table is given below. Determine the molecular formula of A from the MS given below m/z 119 118 Relative abundance (Intensity) 9.9 100 b) Calculate the Index of Hydrogen Deficiency (IHD) for the molecule in A, above. c) Using the information in a...
A. One mechanism of fragmentation is loss of a neutral radical by cleavage of a bond...
A. One mechanism of fragmentation is loss of a neutral radical by cleavage of a bond from which one electron has been lost. What is the m/z ratio of the most stable cationic fragment that can be generated from dexchlorpheniramine by this mechanism? Show the structure of the fragment and discuss charge stabilization. B. The base peak in the dexchlorpheniramine mass spectrum occurs at m/z 203. A peak with relative intensity 33.1 occurs at m/z 205. Interpret this information with...
2. Match the electron impact (El) mass spectrum with the correct structure from the choices below....
2. Match the electron impact (El) mass spectrum with the correct structure from the choices below. ectra of the following molecules (write the correct letter in the upper left-hand corner of the spectra). Draw the structure of the indicated fragments (*) A OH *(43) *(71) * (43) 100- MS-NU-O1 Relative Intensity Relative Intensity 10 20 30 40 50 70 80 90 100 10 30 40 60 70 50 /z 60 /z m m
5. Draw a structure for and name a compound that is consistent with compound that is...
5. Draw a structure for and name a compound that is consistent with compound that is consistent with the following MS. abundance 73 M 80 90 100 110 120 130 140 150 160 10 20 30 40 50 60 70 m/z Question 5: Structure and name: Mass Spectrum (include the molecular ion) Observed Fragment & MW Expected MW Fragmentation type Explanation:
2. Match the electron impact (El) mass spectrum with the correct structure from the choices below....
2. Match the electron impact (El) mass spectrum with the correct structure from the choices below. of the fragments in the El spectra of the following molecules (write the correct letter in the upper left-hand corner of the spectra). Draw the structure of the indicated fragments (*) С В OH H *(43) *(71) *(43) 100 HS--1 100- -N-113 во- 80- 60- 60- 40- 40- 20- 20- m/z m/z 3. Predict the molecular ion peak pattern (El spectrum low resolution) for...
1. Consider the Mass Spectrum below to answer the following questions: MS-NU-S495 Relative Intensity 0- 10...
1. Consider the Mass Spectrum below to answer the following questions: MS-NU-S495 Relative Intensity 0- 10 prote 20 30 40 t 50 to 60 70 m/z 80 90 100 110 a. (1 point) What is the m/z of the molecular ion peak: b. (1 point) What is the m/z value of the base peak: c. (2 point) Explain why do we observe the peak at m/z = 114 d. (2 points) The molecular formula of this compound is C.HSX. Identify...
Label the peaks that characterize the structure. Functional Group(s): HNMR Label each peak with the type...
Label the peaks that characterize the structure. Functional Group(s): HNMR Label each peak with the type of hydrogen from the structure. Molecular Structure: triplet quartet ppm O A -Br OB. CH ос с 9 D. CH2-CH, Label the peaks that characterize the structure Functional Group(s): HNMR Label each peak with the type of hydrogen from the structure. Molecular Structure: triplet quartet ОА -Br OB. -CH Occ ® D -CH2-CH, Doent Colantion 1 Points on 39 of 40 from the original...
18. The mass spectrum of 2-methylpentan-3-ol is shown below. Draw the structure of the fragment ions of m/z= 73 and...
18. The mass spectrum of 2-methylpentan-3-ol is shown below. Draw the structure of the fragment ions of m/z= 73 and 59. Relative abundance (%) TTT 10 20 80 80 100 120 mi
CH3 Cl 100 Base 10) The El-MS of 2-chloro-2- methylpropane is shown at right. Draw the...
CH3 Cl 100 Base 10) The El-MS of 2-chloro-2- methylpropane is shown at right. Draw the structure of the cation corresponding to the base peak. Clearly indicate where the charge resides. You need only show one of the two resonance forms. MS-NW-1505 no parent ion detected 92- Relative Intensity 10 15 20 25 30 35 40 55 60 65 70 75 80 45 50 m/z The 3:1 ratio of peak intensities at 77 and 79 m/z in the El-MS above...
OK, now to look at the fragments. This is the most difficult aspect of interpreting MS data, and fortunately you often don't need to do this yourself (let a computer do it!) Consider this spectrum which is for a molecule of formula C3H1.0.(M) - 86. Relative Abundance T 20 0 10 ill 30 40 50 60 70 80 90 m/z This molecule is an aldehyde or ketone with a formula of CsH100. Draw all isomers of this formula that have...
6. Characterization and Synthesis (20 points total) Use the information provided below and the IR and NMR spectra on the next page to answer the following questions. a) An MS was taken of molecule A and the table is given below. Determine the molecular formula of A from the MS given below m/z 119 118 Relative abundance (Intensity) 9.9 100 b) Calculate the Index of Hydrogen Deficiency (IHD) for the molecule in A, above. c) Using the information in a...
2. Match the electron impact (El) mass spectrum with the correct structure from the choices below. ectra of the following molecules (write the correct letter in the upper left-hand corner of the spectra). Draw the structure of the indicated fragments (*) A OH *(43) *(71) * (43) 100- MS-NU-O1 Relative Intensity Relative Intensity 10 20 30 40 50 70 80 90 100 10 30 40 60 70 50 /z 60 /z m m
5. Draw a structure for and name a compound that is consistent with compound that is consistent with the following MS. abundance 73 M 80 90 100 110 120 130 140 150 160 10 20 30 40 50 60 70 m/z Question 5: Structure and name: Mass Spectrum (include the molecular ion) Observed Fragment & MW Expected MW Fragmentation type Explanation:
2. Match the electron impact (El) mass spectrum with the correct structure from the choices below. of the fragments in the El spectra of the following molecules (write the correct letter in the upper left-hand corner of the spectra). Draw the structure of the indicated fragments (*) С В OH H *(43) *(71) *(43) 100 HS--1 100- -N-113 во- 80- 60- 60- 40- 40- 20- 20- m/z m/z 3. Predict the molecular ion peak pattern (El spectrum low resolution) for...
1. Consider the Mass Spectrum below to answer the following questions: MS-NU-S495 Relative Intensity 0- 10 prote 20 30 40 t 50 to 60 70 m/z 80 90 100 110 a. (1 point) What is the m/z of the molecular ion peak: b. (1 point) What is the m/z value of the base peak: c. (2 point) Explain why do we observe the peak at m/z = 114 d. (2 points) The molecular formula of this compound is C.HSX. Identify...
Label the peaks that characterize the structure. Functional Group(s): HNMR Label each peak with the type of hydrogen from the structure. Molecular Structure: triplet quartet ppm O A -Br OB. CH ос с 9 D. CH2-CH, Label the peaks that characterize the structure Functional Group(s): HNMR Label each peak with the type of hydrogen from the structure. Molecular Structure: triplet quartet ОА -Br OB. -CH Occ ® D -CH2-CH, Doent Colantion 1 Points on 39 of 40 from the original...
18. The mass spectrum of 2-methylpentan-3-ol is shown below. Draw the structure of the fragment ions of m/z= 73 and 59. Relative abundance (%) TTT 10 20 80 80 100 120 mi
CH3 Cl 100 Base 10) The El-MS of 2-chloro-2- methylpropane is shown at right. Draw the structure of the cation corresponding to the base peak. Clearly indicate where the charge resides. You need only show one of the two resonance forms. MS-NW-1505 no parent ion detected 92- Relative Intensity 10 15 20 25 30 35 40 55 60 65 70 75 80 45 50 m/z The 3:1 ratio of peak intensities at 77 and 79 m/z in the El-MS above...
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