For each of the following potential unknown list the key IR frequencies that will distinguish their...
For each of the following potential unknown list the key IR frequencies that will distinguish their identity: m-toulic acid, Phenanthrene, Salicylic acid, fluorine, 4-bromobenzonitrile, azelaic acid
Homework Answers
m-toluic acid
the broadband at around 3000 cm-1 is due to hydroxy group stretching frequency
the strong band at around 1700 cm-1 is due to carbonyl group stretching frequency
the band at around 1580 cm-1 is due to C=C group stretching of the aromatic ring
Phenanthrene
the band at around 3025 cm-1 is due to aromatic CH stretching frequency
the band at around 1560 cm-1 is due to aromatic C=C stretching frequency
Salicylic acid
the band at around 3300 cm-1 is due to the hydroxy group
the broadband at around 3000 cm-1 is due to hydroxy group of carboxylic acid
the band at around 1680 cm-1 is due to the carbonyl group
the band at around 3025 cm-1 is due to aromatic CH stretching frequency
fluorene
the band at around 3050 cm-1 is due to aromatic CH stretching frequency
the band at around 1580 cm-1 is due to aromatic C=C stretching frequency
4-bromobenzonitrile
the band at around 3025 cm-1 is due to aromatic CH stretching frequency
the band at around 1500 and 1580 cm-1 is due to aromatic C=C stretching frequency
the band at around at 2100 cm-1 is due to C
N
stretching frequency
azelaic acid
the broadband at around 3000 cm-1 is due to hydroxy group stretching frequency
the strong band at around 1700 cm-1 is due to carbonyl group stretching frequency
the band at 2850 - 2950 cm-1 is due to aliphatic CH stretching frequency
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For each of the following potential unknown list the key IR
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IR Unknown #17 THASHETTANCE 4000 3000 2000 1500 HRVENUMBER 1000 01.0 100 2881.98 559.20 2935.81 C- H 2969.02 stretch 13...
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acid ork? at least 102 carboxylic 2.) The IR of this compound shows a st unknown....
acid ork? at least 102 carboxylic 2.) The IR of this compound shows a st unknown. Give the structures of key fragmen form. a strong peak at 1714 cm 1. Give two plausible structures for this Key fragmentation ions and provide the mechanism by which they a tot a carboxylic acid Prisent hipead Bp 57 Mersity No pak@ 70 tt 110 80 90 100 Orthithtitill H 10 20 30 40 50 60 70 m/7 m/= 114 .
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2. Explain how you would...
2. Describe the infrared absorption frequencies that would allow you to distinguish between the following pairs...
2. Describe the infrared absorption frequencies that
would allow you to distinguish between the following pairs of
compounds. (10 points)
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3. [8 marks) How could IR spectroscopy be used to distinguish between the following pair of compounds for each prob...
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Using the provided MS and IR spectra, predict the structure and identity of the unknown. Show...
Using the provided MS and IR spectra, predict the structure and
identity of the unknown. Show all workings and reasoning. Identify
important peaks or fragments that led to your conclusion. You are
free to use Rule 13 and/or index of hydrogen deficiency when
necessary.
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ISL dll ULU FT-IR: What functional groups are present in your unknown? List IR frequencies and functional groups. 2 NMR: What information about your unknown can you get from the NMR? 3 MS: What is the possible molecular weight of the unknown? What other mass information is available for the mass spectrum? Index of Refraction: What is the refractive index of your liquid unknown? How does it compare to literature values of your liquid unknown? 5 What is the identity...
IR Unknown #17 THASHETTANCE 4000 3000 2000 1500 HRVENUMBER 1000 01.0 100 2881.98 559.20 2935.81 C- H 2969.02 stretch 1371.74 1255.611 1095.02 1027.65 %T 1183.88C-o stretch 1736.78 C=0 stretch 82 80.77 4000,0 3000 2000 1500 1000 550.0 cm-1 c:\pel_data spectra nguyen.sp - Unknown #17 TUU UL 1014UI LE Stretch aromatic Unknown Number #17 1. For your IR unknown, make a list of the most important absorbance bands and identity the bond producing each absorbance (i.e. 1650 cm-1, C=C stretch). 2....
acid ork? at least 102 carboxylic 2.) The IR of this compound shows a st unknown. Give the structures of key fragmen form. a strong peak at 1714 cm 1. Give two plausible structures for this Key fragmentation ions and provide the mechanism by which they a tot a carboxylic acid Prisent hipead Bp 57 Mersity No pak@ 70 tt 110 80 90 100 Orthithtitill H 10 20 30 40 50 60 70 m/7 m/= 114 .
Pleaseeeee
2. Explain how you would use 'HNMR and IR to distinguish between each of the following pairs: In other words, what difference(s) would you expect in (a) the IR spectra of the two compounds and (b) what difference(s) would you expect in the NMR spectra of the two compounds. (15 points). DO NOT INCLUDE INFO THAT IS COMMON FOR BOTH (a) A IR for B IR for A NMR for A NMR for B
2. Explain how you would...
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would allow you to distinguish between the following pairs of
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An unknown compound with the molecular formula C H N produces the following IR spectrum. What most likely identity of the unknown compound? 100 TRANSMITTANCES 1000 4000 3000 2000 1500 WAVENUMBER (-11 NH NH all IV
Using the provided MS and IR spectra, predict the structure and
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free to use Rule 13 and/or index of hydrogen deficiency when
necessary.
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