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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4:12 minutes

Problem 71a

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>

Verified step by step guidance

Step 1: Analyze the IR spectrum provided. The broad peak around 3300 cm⁻¹ indicates the presence of an N-H or O-H bond, which is characteristic of amines or alcohols. The absence of a sharp peak around 1700 cm⁻¹ suggests that there is no carbonyl group (C=O) in the compound.

Step 2: Compare the IR spectrum with the functional groups in the given compounds. Compound (i) contains an amine group (-NH₂) attached to a cyclohexane ring, which matches the broad peak around 3300 cm⁻¹. Compound (ii) contains both an amine group and a carbonyl group, but the IR spectrum does not show a strong peak around 1700 cm⁻¹, ruling out this compound.

Step 3: Compound (iii) contains an aromatic amine group (-NH₂) attached to a benzene ring. Aromatic compounds typically show peaks in the region of 1500-1600 cm⁻¹ due to C=C stretching, which is not prominent in the IR spectrum provided. This suggests that compound (iii) is not the correct match.

Step 4: Compound (iv) contains a carboxylic acid group (-COOH), which would show a broad O-H stretch around 3000 cm⁻¹ and a sharp C=O stretch around 1700 cm⁻¹. Since the IR spectrum lacks a sharp peak at 1700 cm⁻¹, compound (iv) is not the correct match.

Step 5: Based on the analysis, the IR spectrum corresponds to compound (i), which contains an amine group (-NH₂) attached to a cyclohexane ring. The broad peak around 3300 cm⁻¹ is consistent with the N-H stretching vibration of the amine group.

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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 a technique used to identify and study chemicals based on their absorption of infrared light. Molecules absorb specific wavelengths of IR radiation, causing vibrations in their bonds. The resulting spectrum displays transmittance versus wavenumber, revealing characteristic peaks that correspond to functional groups within the molecule.

Functional Groups

Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. Common functional groups include hydroxyl (-OH), carbonyl (C=O), and carboxylic acid (-COOH). Identifying these groups in an IR spectrum helps in determining the structure of the compound being analyzed.

Peak Interpretation

In an IR spectrum, peaks represent the frequencies at which a molecule absorbs infrared light, indicating the presence of specific functional groups. The position and intensity of these peaks provide information about bond types and molecular structure. For example, a broad peak around 3200-3600 cm⁻¹ typically indicates the presence of an -OH group, while sharp peaks in the 1700-1750 cm⁻¹ range suggest a carbonyl group.

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Related Practice

Textbook Question

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

(b) C₃H₇NO

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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.

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

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>

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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>

Key Concepts

Infrared Spectroscopy (IR)

Functional Groups

Peak Interpretation

Watch next

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>