Propanoic acid and methyl ethanoate are constitutional isomers. 요. CH₂ OH (b) CH3 (c) propanoic acid Show how to distinguish between them by IR spectroscopy. (Use the Appendix.) (a) Which IR bands would one expect for propanoic acid? 1200-1250 cm 1375-1450 cm 1450-1475 cm 1630-1820 cm 1 1 -1 CH3 methyl ethanoate 1700-1725 cm 1735-1800 cm 2720 cm -1 2500-3300 cm 1735-1800 cm 2720 cm -1 CH3 Which IR bands would one expect for methyl ethanoate? -1 1200-1250 cm-¹ 1700-1725 cm7 1375-1450 cm-¹ 1450-1475 cm7 1630-1820 cm 2500-3300 cm 2720 cm -1 -1 -1 -1 2500-3300 cm Which IR bands are unique to, i.e. not shared between, the two sets? 1200-1250 cm-¹ 1700-1725 cm 1375-1450 cm 1735-1800 cm 1450-1475 cm 1630-1820 cm -1 -1 -1 -1 -1

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Chapter1: Chemical Foundations
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Propanoic acid and methyl ethanoate are constitutional isomers.
i
CH₂ OH
(b)
(c)
оооо
CH3.
Show how to distinguish between them by IR spectroscopy. (Use the Appendix.)
(a) Which IR bands would one expect for propanoic acid?
1700-1725 cm-¹
-1
оооо
propanoic acid
оооо
-1
1200-1250 cm
1450-1475 cm
-1
1375 1450 cm
-1
-1
1630-1820 cm
-1
1200-1250 cm
-1
1375 1450 cm
-1
Which IR bands would one expect for methyl ethanoate?
1450-1475 cm
-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
0000
i
CH3
methyl ethanoate
0 0 0 0
1735 1800 cm
-1
2720 cm
2500-3300 cm
1700 1725 cm
-1
1735-1800 cm
2720 cm
-1
CH3
2500-3300 cm
-1
-1
2720 cm
to, i.e. not shared between, the two sets?
1700-1725 cm
-1
-1
1735-1800 cm
-1
-1
2500-3300 cm
-1
Transcribed Image Text:Propanoic acid and methyl ethanoate are constitutional isomers. i CH₂ OH (b) (c) оооо CH3. Show how to distinguish between them by IR spectroscopy. (Use the Appendix.) (a) Which IR bands would one expect for propanoic acid? 1700-1725 cm-¹ -1 оооо propanoic acid оооо -1 1200-1250 cm 1450-1475 cm -1 1375 1450 cm -1 -1 1630-1820 cm -1 1200-1250 cm -1 1375 1450 cm -1 Which IR bands would one expect for methyl ethanoate? 1450-1475 cm -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 0000 i CH3 methyl ethanoate 0 0 0 0 1735 1800 cm -1 2720 cm 2500-3300 cm 1700 1725 cm -1 1735-1800 cm 2720 cm -1 CH3 2500-3300 cm -1 -1 2720 cm to, i.e. not shared between, the two sets? 1700-1725 cm -1 -1 1735-1800 cm -1 -1 2500-3300 cm -1
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