Homework Answers
- First, we count the Number. of Hydrogens. H=10
- Then we see that the there is an IR peak at around 1740 cm-1. This suggests a C=O stretching. This means that the molecule may have a double bond. Further, the IR peak corresponding to 1150 cm-1 is for C-O. This suggests that an ester group might be present because there are both C=O and C-O bonds We will assume only one double bond.
- We know that Hydrogen deficiency index, HDI = (2C+2-H)/2. Putting H=10 and assuming HDI =1 (Corresponding to C=O, we will have no. of carbon atoms as 5.
- Thus the formula of an ester with 5 carbon becomes C5H10O2. Mass of this compound will be 102 g/mol. This corresponds to the m/z parent peak of 102. Thus, the chemical formula is confirmed. Now we will use NMR data to predict the compound.
- We notice a -CH3 group having a single peak at around 2.3 ppm. This means that this CH3 signal does not undergo splitting and thus it must be attached to the C=O i.e. the Carbonyl carbon.
- 2H near 4.2 ppm suggests -CH2 group attached to Oxygen and because it is a triplet, it suggests that it is further attached to -CH2 group.
- The second -CH2- group at 1.7 ppm is a sextet means that one one side it is attached by -CH2- and on other side we have -CH3 group having 0.9 ppm
- Completing the structure, we have,
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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...
parent ion at m/z 102 (M*), IR peaks at 1740 and 1150 cm 10. Propose a...
parent ion at m/z 102 (M*), IR peaks at 1740 and 1150 cm 10. Propose a structure for a molecule whose mass spectrum shows which gave the following 'H NMR spectrum.) 6 1 septet 2 5 0 6 PPM 11. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 116 (M*) with at 1740 and 1150 cm1 which gave the following H NMR spectrum. base peak at m/z 43, IR peaks 6 1 2...
SPECTROSCOPY PROBLEM SET (Homework Assignment 2) [2 pts] Due November 18, 2019 Score: Name: 1. Propose...
SPECTROSCOPY PROBLEM SET (Homework Assignment 2) [2 pts] Due November 18, 2019 Score: Name: 1. Propose a structure for a hydrocarbon whose mass spectrum shows a parention at m/z 100, a base peak at m/z 43 which gave the following 'H NMR spectrum. PPM 2. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 86 with a base peak at m/z 29, an IR peak at 1720 cm' and which gave the following 'H...
16. Propose a structure for a molecule of formula CaHsCl which gave the following 1H NMR spectrum. PPM 17. Propose a st...
16. Propose a structure for a molecule of formula CaHsCl which gave the following 1H NMR spectrum. PPM 17. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 148, an IR peak at 1680 cm'and gives the following H and 13C NMR spectra 3H зн 2H 2H 2H 3 5 2 7 6 4 PPM 160 140 180 60 220 200 20 0 120 100 80 40 PPM -
Can someone please explain how to do this? Thanks in advance! 2. Propose a structure for...
Can someone please explain how to do this? Thanks in
advance!
2. Propose a structure for a molecule whose mass spectrum shows a parention at m/z 86 with a base peak at m/z 29. an IR peakat 1720 cm and which gave the following 'H NMR spectrum. PPM e a narention at m/z 86 with a base peak at mvz 43, an IR peak at
The mass spectrum of compound A shows molecular ion peak at m/z 88. The IR spectrum...
The mass spectrum of compound A shows molecular ion peak at m/z 88. The IR spectrum of this compound has a broad peak between 3200 and 3550 cm-1. The 1H NMR spectrum of A shows the following peaks: a triplet at d 0.9, a singlet at d 1.1, one more singlet at d 1.15, and a quartet at d 1.6. The area ratio of these peaks is 3:6:1:2. The 13C NMR contains 4 signals. In the space below, propose a...
Compound C has molecular formula C9H10O. The mass spectrum shows a parent ion (M+) peak at...
Compound C has molecular formula C9H10O. The mass spectrum shows a parent ion (M+) peak at 134 and a base peak (largest peak) at 105 atomic mass units. The IR spectrum shows major signals at 3029, 2925, 2721, 1708, 1495, 1452, 1375, 1152, 745, and 699 cm-1. The 1H-NMR spectrum shows signals at 2.35 (singlet, 3H), 3.65 (doublet, 2H), 7.11 (doublet 2H), 7.18 (doublet, 2H), and 9.73 (triplet, 1H) ppm. The 13C-NMR spectrum shows signals at 21.1, 50.2, 128.7, 129.5,...
(c) Compound C has molecular formula C9H10O. The mass spectrum shows a parent ion (M+) peak...
(c) Compound C has molecular formula C9H10O. The mass spectrum shows a parent ion (M+) peak at 134 and a base peak (largest peak) at 105 atomic mass units. The IR spectrum shows major signals at 3029, 2925, 2721, 1708, 1495, 1452, 1375, 1152, 745, and 699 cm-1. The 1H-NMR spectrum shows signals at 2.35 (singlet, 3H), 3.65 (doublet, 2H), 7.11 (doublet 2H), 7.18 (doublet, 2H), and 9.73 (triplet, 1H) ppm. The 13C-NMR spectrum shows signals at 21.1, 50.2, 128.7,...
Which types of bonds can be identified in the IR spectrum of Molecule A? I Select] By identifying the molecular ion, determine which composition is consistent with the mass spectrum of A. I Selec...
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I am not understanding this assignment at all. Any assistance is very much appreciated. Mass Spectrum: Molecular Ion m/z value and structure of the Molecular Ion. Base Peak m/z value and structure of...
I am not understanding this assignment at all. Any assistance is
very much appreciated.
Mass Spectrum:
Molecular Ion m/z value and structure of the Molecular Ion.
Base Peak m/z value and structure of that ion
One other significant peak m/z value and structure of that
ion
C13 NMR Spectrum-- Draw Structure of Compound
on the C13 NMR spectrum and identify each signal with the
appropriate Carbon.
Proton NMR Spectrum-- Draw Structure of
Compound on the Proton NMR spectrum and identify...
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...
parent ion at m/z 102 (M*), IR peaks at 1740 and 1150 cm 10. Propose a structure for a molecule whose mass spectrum shows which gave the following 'H NMR spectrum.) 6 1 septet 2 5 0 6 PPM 11. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 116 (M*) with at 1740 and 1150 cm1 which gave the following H NMR spectrum. base peak at m/z 43, IR peaks 6 1 2...
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Can someone please explain how to do this? Thanks in
advance!
2. Propose a structure for a molecule whose mass spectrum shows a parention at m/z 86 with a base peak at m/z 29. an IR peakat 1720 cm and which gave the following 'H NMR spectrum. PPM e a narention at m/z 86 with a base peak at mvz 43, an IR peak at
Which types of bonds can be identified in the IR spectrum of Molecule A? I Select] By identifying the molecular ion, determine which composition is consistent with the mass spectrum of A. I Select ] How many hydrogen environments are there in Molecule A? ISelect ] The peak at 2.1 ppm in the 1H NMR spectrum of Molecule A is most likely to be a: ISelect ] The peak at 3.1 ppm in the 1H NMR spectrum of Molecule A...
I am not understanding this assignment at all. Any assistance is
very much appreciated.
Mass Spectrum:
Molecular Ion m/z value and structure of the Molecular Ion.
Base Peak m/z value and structure of that ion
One other significant peak m/z value and structure of that
ion
C13 NMR Spectrum-- Draw Structure of Compound
on the C13 NMR spectrum and identify each signal with the
appropriate Carbon.
Proton NMR Spectrum-- Draw Structure of
Compound on the Proton NMR spectrum and identify...
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