Textbook Question
How can you use UV spectroscopy to distinguish between the compounds in each of the following pairs?
b.
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Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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Table of contents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 1)31
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 2)65
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
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Bruice 8th EditionCh. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis SpectroscopyProblem 71b
Bruice 8th EditionCh. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis SpectroscopyProblem 71bChapter 14, Problem 71b
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.
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General Features of IR Spect
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
Give approximate wavenumbers for the major characteristic IR absorption bands that would be given by each of the following compounds:
e.
f.
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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
How can you use UV spectroscopy to distinguish between the compounds in each of the following pairs?
a.
2
views
Textbook Question
Phenolphthalein is an acid–base indicator. In solutions of pH < 8.5, it is colorless; in solutions of pH > 8.5, it is deep red-purple. Account for the change in color.
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Textbook Question
How can you use UV spectroscopy to distinguish between the compounds in each of the following pairs?
c.
2
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