Draw the mass spectrum for Vinyl Acetate: C4H6O2
Homework Answers
Principle: The molecule is bombarded with high velocity electrons to form a generally a cation. It would loss a electron by the collision. The ion formed is called as molecular ion, M+.
M + e- = M]* + + 2e-
The mass spectroscopy is a plot of m/e values of fragmented ion against the relative population.
Now, base peak is the highest populated peak and is taken as reference peak.
Molecular ion sometimes be a base peak it is stable.
Base peak is always related with the most stable cation.
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Draw the mass spectrum for Vinyl Acetate: C4H6O2
a. Draw out the structure. b. Label the...
1. Identify the number of compounds in the image. 2. Find the RT of each compound...
1. Identify the number of
compounds in the image.
2. Find the RT of each compound in the image.
3. Find the percent of each compound in the image.
Compound 15: 2,3-dibromobutane a. Draw out the structure. b. Label the molecular ion peak and base peak. C. Assign structures to the fragment ion peaks at m/e 135 & m/e 137, m/e 107 & m/e 109, and m/e 55. Mass Spectrum 100 80 135 137 Relative Intensity 107 109 214 216...
Name: Starting with the mass spectrum of n-heptane What is the molecular ion? What fragment is...
Name: Starting with the mass spectrum of n-heptane What is the molecular ion? What fragment is lost to generate the ion with m/z =71? What cation does the peak at m/z = 43 represent? What group does the spacing between each set of ions represent? Why is the peak at (M-15), corresponding to loss of -CH3 so small? Draw the structure of 2,4-dimethylpentane What is the structure of the ion responsible for m/z = 85? Relative Intensity What is the...
4. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z...
4. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 100 with a base peak at m/z 43, an IR peak at 1720 cm' which gave the following 'H NMR spectrum. 33 N - PPM 5. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 100 with a base peak at m/z 43, an IR peak at 1720 cm' which gave the following 'H NMR spectrum. doublet 2...
Description: Shown below is an EI-MS spectrum for t-butyl chloride. 1) Clearly label the base peak...
Description: Shown below is an EI-MS spectrum for t-butyl chloride. 1) Clearly label the base peak in the spectrum. Draw the structure of the fragment the base peak corresponds to. 2) Is there a molecular ion present in the spectrum? If so, label the peak that corresponds to the molecular ion. 3) Is there any evidence that the following EI-MS spectrum represents a chlorine containing compound? If so, label the necessary peaks and explain briefly why there is sufficient evidence...
5. Identify the base peak in your mass spectrum. 6. Are there other significant isotope patterns...
5. Identify the base peak in your mass spectrum. 6. Are there other significant isotope patterns in your mass spectrum? If so, what do they indicate? 7. Provide at least one fragment (not the parent ion) that was useful in determining (or confirming) the structure of the unknown and briefly explain how it was useful. Compound 14 is a liquid (b.p. 85") which finds its greatest application as an aprotic solvent UV-transparent; IR-liquid fim. MASS SPECTRAL DATA 99 100 Mass...
In Lab H, you will be introduced to mass spectrometry as a new analytical technique for identifyi...
In Lab H, you will be introduced to mass spectrometry as a new analytical technique for identifying molecules. A simplified mass spectrum for ethane is shown below. Use the dropdown menus to identify the base peak and molecular ion peak 14 16 18 20 22 24 26 28 30 32 (m/z) BASE PEAK: Select ] MOLECULAR ION PEAK: [ Select ] Given the mass of the base and molecular ion peaks, choose the two most common fragments of ethane: FRAGMENT...
Identify the structure. TTITITTTTTTT M 2270 problem 5 IR spectrum (liquid film) 1745 4000 3000 2000...
Identify the structure.
TTITITTTTTTT M 2270 problem 5 IR spectrum (liquid film) 1745 4000 3000 2000 V 03 1600 ) 12008 (cm mass spectrum yo absorbance UV spectrum no significant absorption above 210nm og 86 Mt 113 CH,NO 250- 300 (nm) TTT 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 310 m/e TT ZOMHz carbon-13 NMR spectrum CDCi, solution off-resonance decoupled proton decoupled 220 - 200 180 160 140 120 100 80...
The mass spectrum of 3-bromopropanoic acid is shown below. Four peaks are labeled with A, B,...
The mass spectrum of 3-bromopropanoic acid is shown below. Four peaks are labeled with A, B, C, and D. Select the label for the base peak(s). 45 55 18 26 on 10 20 30 40 50 60 70 80 90 100 MIZ 110 120 130 140 150 160 170 The mass spectrum of 3-bromopropanoic acid is shown below. Four peaks are labeled with A, B, C, and D. Select the label for the M peak(s) (unfragmented parent). 135 27 45...
a) Describe the difference between the base peak and the parent ion (or molecular ion) peak....
a) Describe the difference between the base peak and the parent
ion (or molecular ion) peak.
b) Identify the base peak and the parent ion (or molecular ion)
peak (if any) according to the mass spectrum.
c) Identify the mass fragments which correspond to m/z = 77,
105, 111, and 139.
d) Identify and give explanations for the magnitude (or
intensity) of the peaks at m/z = 113, 141, and 218.
Mass Spectrum ofp-C hlorobenzophenone 105 100 80 139 CI...
Use the mass spectrum to answer the questions below Does the compound contain chlorine or bromine...
Use the mass spectrum to answer the questions below
Does the compound contain chlorine or bromine or neither?
Explain.
Give the m/z value for the molecular ion peak.
Give the m/z value for the base peak.
The base peak is a common fragment – what is the most likely
chemical formula for the base peak?
Does the compound contain chlorine or bromine or neither?
Explain.
Give the m/z value for the molecular ion peak.
Give the m/z value for the...
1. Identify the number of
compounds in the image.
2. Find the RT of each compound in the image.
3. Find the percent of each compound in the image.
Compound 15: 2,3-dibromobutane a. Draw out the structure. b. Label the molecular ion peak and base peak. C. Assign structures to the fragment ion peaks at m/e 135 & m/e 137, m/e 107 & m/e 109, and m/e 55. Mass Spectrum 100 80 135 137 Relative Intensity 107 109 214 216...
Name: Starting with the mass spectrum of n-heptane What is the molecular ion? What fragment is lost to generate the ion with m/z =71? What cation does the peak at m/z = 43 represent? What group does the spacing between each set of ions represent? Why is the peak at (M-15), corresponding to loss of -CH3 so small? Draw the structure of 2,4-dimethylpentane What is the structure of the ion responsible for m/z = 85? Relative Intensity What is the...
4. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 100 with a base peak at m/z 43, an IR peak at 1720 cm' which gave the following 'H NMR spectrum. 33 N - PPM 5. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 100 with a base peak at m/z 43, an IR peak at 1720 cm' which gave the following 'H NMR spectrum. doublet 2...
Description: Shown below is an EI-MS spectrum for t-butyl chloride. 1) Clearly label the base peak in the spectrum. Draw the structure of the fragment the base peak corresponds to. 2) Is there a molecular ion present in the spectrum? If so, label the peak that corresponds to the molecular ion. 3) Is there any evidence that the following EI-MS spectrum represents a chlorine containing compound? If so, label the necessary peaks and explain briefly why there is sufficient evidence...
5. Identify the base peak in your mass spectrum. 6. Are there other significant isotope patterns in your mass spectrum? If so, what do they indicate? 7. Provide at least one fragment (not the parent ion) that was useful in determining (or confirming) the structure of the unknown and briefly explain how it was useful. Compound 14 is a liquid (b.p. 85") which finds its greatest application as an aprotic solvent UV-transparent; IR-liquid fim. MASS SPECTRAL DATA 99 100 Mass...
In Lab H, you will be introduced to mass spectrometry as a new analytical technique for identifying molecules. A simplified mass spectrum for ethane is shown below. Use the dropdown menus to identify the base peak and molecular ion peak 14 16 18 20 22 24 26 28 30 32 (m/z) BASE PEAK: Select ] MOLECULAR ION PEAK: [ Select ] Given the mass of the base and molecular ion peaks, choose the two most common fragments of ethane: FRAGMENT...
Identify the structure.
TTITITTTTTTT M 2270 problem 5 IR spectrum (liquid film) 1745 4000 3000 2000 V 03 1600 ) 12008 (cm mass spectrum yo absorbance UV spectrum no significant absorption above 210nm og 86 Mt 113 CH,NO 250- 300 (nm) TTT 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 310 m/e TT ZOMHz carbon-13 NMR spectrum CDCi, solution off-resonance decoupled proton decoupled 220 - 200 180 160 140 120 100 80...
The mass spectrum of 3-bromopropanoic acid is shown below. Four peaks are labeled with A, B, C, and D. Select the label for the base peak(s). 45 55 18 26 on 10 20 30 40 50 60 70 80 90 100 MIZ 110 120 130 140 150 160 170 The mass spectrum of 3-bromopropanoic acid is shown below. Four peaks are labeled with A, B, C, and D. Select the label for the M peak(s) (unfragmented parent). 135 27 45...
a) Describe the difference between the base peak and the parent
ion (or molecular ion) peak.
b) Identify the base peak and the parent ion (or molecular ion)
peak (if any) according to the mass spectrum.
c) Identify the mass fragments which correspond to m/z = 77,
105, 111, and 139.
d) Identify and give explanations for the magnitude (or
intensity) of the peaks at m/z = 113, 141, and 218.
Mass Spectrum ofp-C hlorobenzophenone 105 100 80 139 CI...
Use the mass spectrum to answer the questions below
Does the compound contain chlorine or bromine or neither?
Explain.
Give the m/z value for the molecular ion peak.
Give the m/z value for the base peak.
The base peak is a common fragment – what is the most likely
chemical formula for the base peak?
Does the compound contain chlorine or bromine or neither?
Explain.
Give the m/z value for the molecular ion peak.
Give the m/z value for the...
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