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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4:37 minutes

Problem 62c

Textbook Question

Five compounds are shown for each of the IR spectra below. Indicate which of the five compounds is responsible for each spectrum.
c.
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Verified step by step guidance

Step 1: Analyze the IR spectrum provided. The spectrum shows a strong absorption around 1700 cm⁻¹, which is characteristic of a carbonyl (C=O) functional group. This indicates the presence of a compound with a ketone, aldehyde, or similar carbonyl-containing functional group.

Step 2: Look for additional peaks in the spectrum. There is a broad absorption around 3000 cm⁻¹, which corresponds to C-H stretching vibrations. This suggests the compound contains alkyl or aromatic groups.

Step 3: Compare the IR spectrum with the provided compounds. Compound (i) contains a ketone group (C=O) and alkyl groups, which matches the strong absorption at 1700 cm⁻¹ and the C-H stretching around 3000 cm⁻¹. Compound (ii) also contains a carbonyl group, but it is part of an aldehyde, which would typically show a distinct peak around 2700 cm⁻¹ for the aldehyde C-H stretch, not observed here.

Step 4: Eliminate compounds that do not match the spectrum. Compound (iii) contains a nitrile group (C≡N), which would show a sharp peak around 2200 cm⁻¹, not present in the spectrum. Compound (iv) contains an alcohol group (-OH), which would show a broad peak around 3200-3600 cm⁻¹, also not observed.

Step 5: Based on the analysis, compound (i) is the most likely match for the IR spectrum, as its functional groups and structure align with the observed peaks.

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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 based on the absorption of infrared light by a sample. Different functional groups absorb characteristic wavelengths of IR radiation, leading to distinct peaks in the spectrum. By analyzing these peaks, chemists can deduce the presence of specific bonds and functional groups in a compound.

Wavenumbers and Transmittance

In IR spectroscopy, wavenumbers (measured in cm⁻¹) represent the frequency of the absorbed light, while transmittance indicates the amount of light that passes through the sample. Peaks in the spectrum correspond to specific wavenumbers where absorption occurs, indicating the presence of certain functional groups. A lower transmittance value at a given wavenumber signifies stronger absorption.

Functional Group Identification

Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. In IR spectroscopy, each functional group has a unique absorption pattern, allowing chemists to identify them based on the spectrum. For example, O-H bonds typically show strong absorption around 3200-3600 cm⁻¹, while C=O bonds appear around 1700 cm⁻¹.

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Related Practice

Textbook Question

On a day in which the laboratory air conditioning stopped working, a chemist hypothesized that the atmosphere would provide enough ambient heat to drive the nitrile hydrolysis reaction to the carboxylic acid. Based on the IR of the resulting product, was this hypothesis correct?

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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?

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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.

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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

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

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

Key Concepts

Infrared Spectroscopy (IR)

Wavenumbers and Transmittance

Functional Group Identification

Watch next

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