Propanoic acid and methyl ethanoate are constitutional isomers. (b) (c) CH3 (d) CH₂ OH propanoic acid Show how to distinguish between them by IR spectroscopy. (Use the Appendix.) (a) Which IR bands would one expect for propanoic acid? -1 1200-1250 cm 1375-1450 cm7 -1 1450-1475 cm -1 1630-1820 cm 1450-1475 cm -1 1630-1820 cm -1 1200-1250 cm 1375 1450 cm Which IR bands would one expect for methyl ethanoate? 1200-1250 cm 1375-1450 cm 1450-1475 cm -1 1630-1820 cm -1 -1 -1 -1 CH3 methyl ethanoate -1 If the IR spectrum shows a band at 1465 cm, which isomer is it? 1700-1725 cm-1 -1 1735-1800 cm 1 2720 cm 2500-3300 cm 1700-1725 cm 1735-1800 cm Which IR bands are unique to, i.e. not shared between, the two sets? -1 2720 cm CH3 2500-3300 cm 1700-1725 cm 1735-1800 cm 2720 cm-¹ -1 2500-3300 cm -1 -1 -1 -1 -1 -1
Propanoic acid and methyl ethanoate are constitutional isomers. (b) (c) CH3 (d) CH₂ OH propanoic acid Show how to distinguish between them by IR spectroscopy. (Use the Appendix.) (a) Which IR bands would one expect for propanoic acid? -1 1200-1250 cm 1375-1450 cm7 -1 1450-1475 cm -1 1630-1820 cm 1450-1475 cm -1 1630-1820 cm -1 1200-1250 cm 1375 1450 cm Which IR bands would one expect for methyl ethanoate? 1200-1250 cm 1375-1450 cm 1450-1475 cm -1 1630-1820 cm -1 -1 -1 -1 CH3 methyl ethanoate -1 If the IR spectrum shows a band at 1465 cm, which isomer is it? 1700-1725 cm-1 -1 1735-1800 cm 1 2720 cm 2500-3300 cm 1700-1725 cm 1735-1800 cm Which IR bands are unique to, i.e. not shared between, the two sets? -1 2720 cm CH3 2500-3300 cm 1700-1725 cm 1735-1800 cm 2720 cm-¹ -1 2500-3300 cm -1 -1 -1 -1 -1 -1
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
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:Propanoic acid and methyl ethanoate are constitutional isomers.
요.
00
(c)
CH3
оооо
CH₂ OH CH3
Show how to distinguish between them by IR spectroscopy. (Use the Appendix.)
(a) Which IR bands would one expect for propanoic acid?
propanoic acid
оооо
1200-1250 cm -1
-1
1375 1450 cm
-1
1450 1475 cm
-1
1630-1820 cm
-1
1200-1250 cm
-1
1375 1450 cm
(b) Which IR bands would one expect for methyl ethanoate?
1700-1725 cm
-1
1450-1475 cm7
-1
1630 1820 cm
Which IR bands are unique
-1
1200-1250 cm
-1
1375 1450 cm¯
-1
1450-1475 cm
оооо
-1
1630-1820 cm
оооо
methyl ethanoate
(d) If the IR spectrum shows a
band at 1465 cm-¹, which
isomer is it?
1700-1725 cm-¹
-1
1735-1800 cm
2720 cm
−1
2500-3300 cm
оооо
-1
2720 cm
1735-1800 cm
CH3
-1
-1
-1
2500-3300 cm
2720 cm
-1
to, i.e. not shared between, the two sets?
1700-1725 cm
1735-1800 cm
-1
-1
2500-3300 cm
-1
-1
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