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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4:25 minutes

Problem 71b

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>

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Examine the IR spectrum provided. Identify key absorption peaks and their corresponding wavenumbers. For example, look for peaks in the regions associated with functional groups such as O-H, N-H, C=O, and aromatic C-H stretches.

Analyze the broad peak around 3200-3500 cm⁻¹. This is indicative of N-H stretching vibrations, which suggests the presence of an amine group.

Look for a sharp peak near 1700 cm⁻¹. This corresponds to C=O stretching vibrations, which indicates the presence of a carbonyl group.

Check for peaks in the region of 1500-1600 cm⁻¹, which are characteristic of aromatic C=C stretching vibrations. This suggests the presence of an aromatic ring.

Compare the identified functional groups and structural features from the IR spectrum with the given compounds (i, ii, iii, iv). Match the spectrum to the compound that contains both an amine group, a carbonyl group, and an aromatic ring, which is compound ii.

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Key Concepts

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

Infrared Spectroscopy (IR)

Infrared spectroscopy is an analytical technique used to identify molecular structures by measuring the absorption of infrared light by a compound. Different functional groups absorb characteristic wavelengths of IR radiation, resulting in a spectrum that can be analyzed to determine the presence of specific bonds and functional groups in a molecule.

Wavenumber

Wavenumber is a unit of measurement used in spectroscopy, defined as the number of wave cycles per unit distance, typically expressed in cm⁻¹. In IR spectroscopy, wavenumbers correspond to the energy levels of molecular vibrations, allowing chemists to identify specific functional groups based on their unique absorption peaks in the spectrum.

Functional Groups

Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. In IR spectroscopy, the presence of functional groups such as alcohols, carbonyls, and amines can be inferred from the distinct absorption bands observed in the spectrum, aiding in the identification of the compound.

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Related Practice

Textbook Question

Which one of the following five compounds produced the IR spectrum shown below?

<IMAGE>

Textbook Question

Each of the IR spectra shown below is accompanied by a set of four compounds. In each case, indicate which of the four compounds is responsible for the spectrum.

<IMAGE>

Textbook Question

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

<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.

a. <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

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

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

<IMAGE>

Textbook Question

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

(d) C₇H₅O

<IMAGE>

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