Table of contents

1. A Review of General Chemistry5h 5m
2. Molecular Representations1h 14m
3. Acids and Bases2h 46m
4. Alkanes and Cycloalkanes4h 17m
5. Chirality3h 39m
6. Thermodynamics and Kinetics1h 22m
7. Substitution Reactions1h 48m
8. Elimination Reactions2h 30m
9. Alkenes and Alkynes2h 9m
10. Addition Reactions3h 19m
11. Radical Reactions1h 58m
12. Alcohols, Ethers, Epoxides and Thiols2h 42m
13. Alcohols and Carbonyl Compounds2h 17m
14. Synthetic Techniques1h 26m
15. Analytical Techniques:IR, NMR, Mass Spect7h 3m
16. Conjugated Systems6h 13m
17. Ultraviolet Spectroscopy51m
18. Aromaticity2h 34m
19. Reactions of Aromatics: EAS and Beyond5h 1m
20. Phenols55m
21. Aldehydes and Ketones: Nucleophilic Addition4h 56m
22. Carboxylic Acid Derivatives: NAS2h 51m
23. The Chemistry of Thioesters, Phophate Ester and Phosphate Anhydrides1h 10m
24. Enolate Chemistry: Reactions at the Alpha-Carbon1h 53m
25. Condensation Chemistry2h 9m
26. Amines1h 43m
27. Heterocycles2h 0m
28. Carbohydrates5h 53m
29. Amino Acids4h 20m
30. Peptides and Proteins2h 42m
31. Catalysis in Organic Reactions1h 30m
32. Lipids 2h 50m
33. The Organic Chemistry of Metabolic Pathways2h 52m
34. Nucleic Acids1h 32m
35. Transition Metals6h 14m
36. Synthetic Polymers1h 49m

15. Analytical Techniques:IR, NMR, Mass Spect

IR Spect:Drawing Spectra

Organic Chemistry

15. Analytical Techniques:IR, NMR, Mass Spect

IR Spect:Drawing Spectra

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2:53 minutes

Problem 22c

Textbook Question

Match each of the four IR spectra to one of the given compounds. [One of the compounds does not match a spectrum.]
(c) <IMAGE>

Verified step by step guidance

Begin by understanding the basic principles of IR spectroscopy. Infrared (IR) spectroscopy is a technique used to identify functional groups in organic compounds based on the absorption of infrared light at specific wavelengths.

Examine the IR spectra provided. Look for key peaks that correspond to specific functional groups. For example, a broad peak around 3200-3600 cm^-1 typically indicates the presence of an O-H group, while a sharp peak around 1700 cm^-1 suggests a C=O group.

Identify the functional groups present in each of the given compounds. Write down the expected IR absorption ranges for these functional groups. This will help you match the spectra to the compounds.

Compare the observed peaks in each IR spectrum with the expected peaks for the functional groups in the given compounds. Match the spectra to the compounds based on the presence or absence of these key peaks.

Determine which compound does not match any of the spectra. This compound will have functional groups that do not correspond to the peaks observed in any of the IR spectra provided.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Infrared (IR) Spectroscopy

Infrared spectroscopy is an analytical technique used to identify functional groups in organic compounds by measuring the absorption of infrared light at different wavelengths. Each functional group absorbs IR radiation at characteristic frequencies, producing a spectrum that acts like a molecular fingerprint. Understanding these absorption patterns is crucial for matching spectra to specific compounds.

Functional Groups

Functional groups are specific groups of atoms within molecules that have characteristic properties and reactivity. In IR spectroscopy, different functional groups absorb infrared light at specific frequencies, allowing for their identification. For example, carbonyl groups typically show a strong absorption around 1700 cm⁻¹, while hydroxyl groups absorb broadly around 3200-3600 cm⁻¹.

Spectral Analysis

Spectral analysis involves interpreting the peaks and patterns in an IR spectrum to deduce the structure of a compound. This requires comparing the observed absorption bands with known values for various functional groups. By analyzing the presence or absence of specific peaks, one can determine which functional groups are present in the compound, aiding in the identification process.

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Related Practice

Textbook Question

Five compounds are shown for each of the IR spectra below. Indicate which of the five compounds is responsible for each spectrum.

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Textbook Question

Each of the IR spectra shown below is the spectrum of one of the following compounds. Identify the compound that produced each spectrum.

a. <IMAGE>

Textbook Question

Each of the IR spectra shown below is the spectrum of one of the following compounds. Identify the compound that produced each spectrum.

b. <IMAGE>

Textbook Question

Match each of the four IR spectra to one of the given compounds. [One of the compounds does not match a spectrum.]

(d) <IMAGE>

Textbook Question

What functional groups might be present in the IR spectra for the molecules with the given molecular formulas. [Be sure to use the molecular formula in your analysis.]

(b) C₃H₄O₄

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Textbook Question

Given the IR spectrum, suggest what functional groups might correspond to the given molecular formula.

(d) C₇H₅O

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Textbook Question

Hoping to make the following diene, a chemist treated the diol shown with acid. Based on the IR spectrum, was the reaction successful? If not, what compound was made instead?

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Textbook Question

What functional groups are present in a molecule with a molecular formula of C₄H₁₀O and the following IR spectrum? [Use Table 14.2 for this.]

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