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1) How could the pair of structures shown be distinguished using IR spectroscopy? List the diagnostic peaks in wave numbers that would be present or absent for each pair. (a) (b) H N HO NH₂ H Hr

1) How could the pair of structures shown be distinguished using IR spectroscopy? List the diagnostic peaks in wave numbers that would be present or absent for each pair. (a) (b) H N HO NH₂ H Hr

Chemistry
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
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**Question:** 1) How could the pair of structures shown be distinguished using IR spectroscopy? List the diagnostic peaks in wave numbers that would be present or absent for each pair. **Explanation:** **Pair (a):** - The first structure shows a cyclohexylamine compound which includes an NH stretch. The diagnostic IR peak would be around 3300-3500 cm⁻¹, indicating an N-H stretch. - The second structure is ethylamine, which also has NH stretches. The peaks would similarly appear in the 3300-3500 cm⁻¹ region but may differ slightly due to differences in molecular environment. **Pair (b):** - The first structure is a cyclohexyl acetate, which contains a C=O ester functional group. This would produce a strong IR peak around 1735-1750 cm⁻¹ for the carbonyl group. - The second structure is propanal, an aldehyde, which will also display a C=O stretch, but its peak will typically appear around 1720-1740 cm⁻¹. Additionally, aldehydes often show a C-H stretch near 2720-2820 cm⁻¹ due to the aldehyde hydrogen. **Conclusion:** IR spectroscopy distinguishes these structures by identifying the presence or absence of specific functional groups corresponding to these wave numbers.
Transcribed Image Text:**Question:** 1) How could the pair of structures shown be distinguished using IR spectroscopy? List the diagnostic peaks in wave numbers that would be present or absent for each pair. **Explanation:** **Pair (a):** - The first structure shows a cyclohexylamine compound which includes an NH stretch. The diagnostic IR peak would be around 3300-3500 cm⁻¹, indicating an N-H stretch. - The second structure is ethylamine, which also has NH stretches. The peaks would similarly appear in the 3300-3500 cm⁻¹ region but may differ slightly due to differences in molecular environment. **Pair (b):** - The first structure is a cyclohexyl acetate, which contains a C=O ester functional group. This would produce a strong IR peak around 1735-1750 cm⁻¹ for the carbonyl group. - The second structure is propanal, an aldehyde, which will also display a C=O stretch, but its peak will typically appear around 1720-1740 cm⁻¹. Additionally, aldehydes often show a C-H stretch near 2720-2820 cm⁻¹ due to the aldehyde hydrogen. **Conclusion:** IR spectroscopy distinguishes these structures by identifying the presence or absence of specific functional groups corresponding to these wave numbers.
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