CH3 CH₂ propanoic acid ОН 1200-1250 cm 1375 1450 cm Show how to distinguish between them by IR spectroscopy. (Use the Appendix.) (a) Which IR bands would one expect for propanoic acid? 7. 7. 7. 0000 1450 1475 cm CH3 1630-1820 cm CH3 methyl ethanoate 1700 1725 cm 1735 1800 cm-¹ 2720 cm-¹ 2500-3300 cm-¹

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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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Propanoic acid and methyl ethanoate are constitutional isomers.
i
||
CH2 OH
(b)
(c)
оооо
Show how to distinguish between them by IR spectroscopy. (Use the Appendix.)
(a) Which IR bands would one expect for propanoic acid?
CH3
оооо
propanoic acid
оооо
1200-1250 cm
1375 1450 cm
-1
1450-1475 cm
1630-1820 cm
-1
-1
1200-1250 cm
-1
1375 1450 cm
1450-1475 cm
-1
1630-1820 cm
Which IR bands would one expect for methyl ethanoate?
1700 1725 cm
-1
1200-1250 cm
1375 1450 cm
1450-1475 cm
1630-1820 cm
-1
CH3
methyl ethanoate
-1
1700 1725 cm
-1
-1
1735-1800 cm
2720 cm
2500-3300 cm
1735-1800 cm
-1
2720 cm
-1
CH3
-1
Which IR bands are unique to, i.e. not shared between, the two sets?
-1
-1
-1
-1
2500-3300 cm
-1
1700 1725 cm
1735-1800 cm
2720 cm
2500-3300 cm
-1
-1
-1
(d) If the IR spectrum shows a band at 3080 cm-¹, which isomer is it?
Opropanoic acid
Omethyl ethanoate
Transcribed Image Text:Propanoic acid and methyl ethanoate are constitutional isomers. i || CH2 OH (b) (c) оооо Show how to distinguish between them by IR spectroscopy. (Use the Appendix.) (a) Which IR bands would one expect for propanoic acid? CH3 оооо propanoic acid оооо 1200-1250 cm 1375 1450 cm -1 1450-1475 cm 1630-1820 cm -1 -1 1200-1250 cm -1 1375 1450 cm 1450-1475 cm -1 1630-1820 cm Which IR bands would one expect for methyl ethanoate? 1700 1725 cm -1 1200-1250 cm 1375 1450 cm 1450-1475 cm 1630-1820 cm -1 CH3 methyl ethanoate -1 1700 1725 cm -1 -1 1735-1800 cm 2720 cm 2500-3300 cm 1735-1800 cm -1 2720 cm -1 CH3 -1 Which IR bands are unique to, i.e. not shared between, the two sets? -1 -1 -1 -1 2500-3300 cm -1 1700 1725 cm 1735-1800 cm 2720 cm 2500-3300 cm -1 -1 -1 (d) If the IR spectrum shows a band at 3080 cm-¹, which isomer is it? Opropanoic acid Omethyl ethanoate
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