a) Methoxy ethylene (H2C=CHOCH3) and propanal (CH3CH2CHO) are constitutional isomers.State the wavenumbers and bonds associated to differentiate these isomers as in IR tableprovided. Wavenumber, cm1BondFunctional GroupC- H (sp°,2960-2850(s)Alkanes2760 - 2700, 2860 - 2800 (w),(a pair of bands)С-НAldehydes3080 - 3020 (m)C- H (sp?,Alkenes3100 - 3000 (m)C-HAromatic Rings3333 - 3267 (s)C- H (sp)Alkynes1680-1640 (m, w)C=CAlkenes2260 - 2100 (m)C=CAlkynesAromatic Rings1600, 1500 (w), usually showsseveral peaksC=C1400 - 1090 (s)C-OAlcohols, Ethers, Esters1320-1210 (m)C-OCarboxylic acids1760 - 1670 (s)Aldehydes, Ketones, Carboxylic acids,EstersC=O3600 -3200 (b)О-НHydrogen-bonded - Alcohols,Phenols3400 - 2500 (b)O-HCarboxylic acids3500 - 3300 (m)N-HAmines1340 - 1020 (m)C-NAmines2260- 2220 (m)C=NNitrilesIntensities: s = strong, m = medium, w = weak, b = broadh = 6.63 x 10-34 Jsc = 3.00 x 10 ms1

We can differentiate various compounds using IR spectroscopy.

Answered: a) Methoxy ethylene (H2C=CHOCH3) and…

a) Methoxy ethylene (H2C=CHOCH3) and propanal (CH3CH2CHO) are constitutional isomers. State the wavenumbers and bonds associated to differentiate these isomers as in IR table provided.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

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Question

a) Methoxy ethylene (H2C=CHOCH3) and propanal (CH3CH2CHO) are constitutional isomers.
State the wavenumbers and bonds associated to differentiate these isomers as in IR table
provided.

Wavenumber, cm1
Bond
Functional Group
C- H (sp°,
2960-2850(s)
Alkanes
2760 - 2700, 2860 - 2800 (w),
(a pair of bands)
С-Н
Aldehydes
3080 - 3020 (m)
C- H (sp?,
Alkenes
3100 - 3000 (m)
C-H
Aromatic Rings
3333 - 3267 (s)
C- H (sp)
Alkynes
1680-1640 (m, w)
C=C
Alkenes
2260 - 2100 (m)
C=C
Alkynes
Aromatic Rings
1600, 1500 (w), usually shows
several peaks
C=C
1400 - 1090 (s)
C-O
Alcohols, Ethers, Esters
1320-1210 (m)
C-O
Carboxylic acids
1760 - 1670 (s)
Aldehydes, Ketones, Carboxylic acids,
Esters
C=O
3600 -3200 (b)
О-Н
Hydrogen-bonded - Alcohols,Phenols
3400 - 2500 (b)
O-H
Carboxylic acids
3500 - 3300 (m)
N-H
Amines
1340 - 1020 (m)
C-N
Amines
2260- 2220 (m)
C=N
Nitriles
Intensities: s = strong, m = medium, w = weak, b = broad
h = 6.63 x 10-34 Js
c = 3.00 x 10 ms1

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