Textbook Question
How many sets of equivalent hydrogens are in each molecule shown?
(c)
2
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Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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Table of contents
- Ch. 2 - General Chemistry Translated: Finding the Electrons114
- Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis109
- Ch. 4 - Acids and Bases: Electron Flow144
- Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics118
- Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space112
- Ch. 7 - Principles of Green (Organic) Chemistry3
- Ch. 8 - Alkenes I: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes II: Oxidation and Reduction150
- Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions101
- Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions108
- Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes172
- Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination239
- Ch. 14 - Structural Identification I: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution I: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution II: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems I: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems II: Pericyclic Reactions54
- Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene II: Reactions Influenced by the Aromatic Ring62
- Ch. 25 - Amines: Structure, Reactions, and Synthesis27
- Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis9
- Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids54
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Not the one you use?Change textbook
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Mullins 1st EditionCh. 15 - Structural Identification II: Nuclear Magnetic Resonance SpectroscopyProblem 14b
Mullins 1st EditionCh. 15 - Structural Identification II: Nuclear Magnetic Resonance SpectroscopyProblem 14bChapter 14, Problem 14b
How many sets of equivalent hydrogens are in each molecule shown?
(b) 
Verified step by step guidance1
Identify the molecular structure of the given compound. Look for any symmetry or repeating units within the molecule, as these can indicate equivalent hydrogens.
Examine the carbon skeleton of the molecule. Hydrogens attached to the same carbon atom or to equivalent carbon atoms (due to symmetry) are typically equivalent.
Consider the presence of functional groups or substituents. Hydrogens in similar chemical environments, such as those adjacent to the same functional group, are often equivalent.
Analyze the molecule for any plane of symmetry or center of symmetry. Hydrogens that are mirrored across a plane of symmetry or are symmetrically equivalent will be equivalent.
Count the distinct sets of equivalent hydrogens based on your analysis. Each set corresponds to hydrogens that are in the same chemical environment and are indistinguishable by NMR spectroscopy.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Equivalent Hydrogens
Equivalent hydrogens are hydrogen atoms in a molecule that are in identical chemical environments. They exhibit the same chemical shift in NMR spectroscopy because they are indistinguishable by the spectrometer. Identifying equivalent hydrogens is crucial for predicting the number of signals in a proton NMR spectrum.
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Chemical Environment
The chemical environment of a hydrogen atom in a molecule is determined by the surrounding atoms and the molecular structure. Factors such as electronegativity, hybridization, and proximity to functional groups influence the chemical environment. Understanding these factors helps in identifying equivalent hydrogens and predicting NMR spectra.
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NMR Spectroscopy
Nuclear Magnetic Resonance (NMR) spectroscopy is a technique used to determine the structure of organic compounds by observing the behavior of nuclei in a magnetic field. In proton NMR, equivalent hydrogens produce a single signal, while non-equivalent hydrogens produce distinct signals. Analyzing these signals helps in deducing the molecular structure.
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Related Practice
Textbook Question
How many sets of equivalent hydrogens are in each molecule shown?
(a)
1
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Textbook Question
Draw the peak that would correspond to the hydrogens at C₃ in the molecule shown. Be sure to indicate the integration and place it at an appropriate chemical shift.
1
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Textbook Question
How many unique ¹H NMR signals would you expect in an NMR spectrum for the following molecules?
(a)
1
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Textbook Question
How many unique ¹H NMR signals would you expect in an NMR spectrum for the following molecules?
(b)
Textbook Question
Calculate the index of hydrogen deficiency for curacin A, which has a molecular formula of C23H35NOS .
6
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