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How would each of the following pairs of compounds differ in their IR spectrum? and and HO

How would each of the following pairs of compounds differ in their IR spectrum? and and HO

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
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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**Comparison of IR Spectra between Compound Pairs** **Question:** How would each of the following pairs of compounds differ in their IR spectrum? **Pair 1:** - **Compound 1:** Cyclohexane (hexagonal ring structure) - **Compound 2:** 1-Hexyne (linear structure with a triple bond between the first and second carbon atoms from the left) **Expected IR Spectral Differences for Pair 1:** Cyclohexane will show absorptions typical of alkanes: - C-H stretch: Around 2850-2960 cm^-1 - No significant absorptions associated with triple bonds. 1-Hexyne, containing a triple bond (C≡C), will display: - C≡C stretch: Around 2100-2260 cm^-1 - Terminal alkyne C-H stretch: Around 3300 cm^-1 (sharp peak) - Aliphatic C-H stretch: Around 2850-2950 cm^-1 **Pair 2:** - **Compound 1:** 2-Butanone (linear structure with a carbonyl group (C=O) on the second carbon from the left) - **Compound 2:** 1-Butanol (linear structure with a hydroxyl group (OH) on the first carbon from the left) **Expected IR Spectral Differences for Pair 2:** 2-Butanone will exhibit strong absorptions due to the carbonyl group: - C=O stretch: Around 1650-1750 cm^-1 (strong) - Aliphatic C-H stretch: Around 2850-2960 cm^-1 1-Butanol will show absorptions due to the hydroxyl group: - O-H stretch: Around 3200-3550 cm^-1 (broad and strong) - Aliphatic C-H stretch: Around 2850-2960 cm^-1 - C-O stretch: Around 1050-1300 cm^-1 **Summary of IR Spectral Differences:** - **Cyclohexane vs. 1-Hexyne:** Presence of absorptions related to a triple bond in 1-Hexyne. - **2-Butanone vs. 1-Butanol:** Presence of a strong carbonyl absorption in 2-Butanone and a broad O-H absorption in 1-Butanol.
Transcribed Image Text:**Comparison of IR Spectra between Compound Pairs** **Question:** How would each of the following pairs of compounds differ in their IR spectrum? **Pair 1:** - **Compound 1:** Cyclohexane (hexagonal ring structure) - **Compound 2:** 1-Hexyne (linear structure with a triple bond between the first and second carbon atoms from the left) **Expected IR Spectral Differences for Pair 1:** Cyclohexane will show absorptions typical of alkanes: - C-H stretch: Around 2850-2960 cm^-1 - No significant absorptions associated with triple bonds. 1-Hexyne, containing a triple bond (C≡C), will display: - C≡C stretch: Around 2100-2260 cm^-1 - Terminal alkyne C-H stretch: Around 3300 cm^-1 (sharp peak) - Aliphatic C-H stretch: Around 2850-2950 cm^-1 **Pair 2:** - **Compound 1:** 2-Butanone (linear structure with a carbonyl group (C=O) on the second carbon from the left) - **Compound 2:** 1-Butanol (linear structure with a hydroxyl group (OH) on the first carbon from the left) **Expected IR Spectral Differences for Pair 2:** 2-Butanone will exhibit strong absorptions due to the carbonyl group: - C=O stretch: Around 1650-1750 cm^-1 (strong) - Aliphatic C-H stretch: Around 2850-2960 cm^-1 1-Butanol will show absorptions due to the hydroxyl group: - O-H stretch: Around 3200-3550 cm^-1 (broad and strong) - Aliphatic C-H stretch: Around 2850-2960 cm^-1 - C-O stretch: Around 1050-1300 cm^-1 **Summary of IR Spectral Differences:** - **Cyclohexane vs. 1-Hexyne:** Presence of absorptions related to a triple bond in 1-Hexyne. - **2-Butanone vs. 1-Butanol:** Presence of a strong carbonyl absorption in 2-Butanone and a broad O-H absorption in 1-Butanol.
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