Textbook Question
How many sets of equivalent hydrogens are in each molecule shown?
(c)
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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 14a
Mullins 1st EditionCh. 15 - Structural Identification II: Nuclear Magnetic Resonance SpectroscopyProblem 14aChapter 14, Problem 14a
How many sets of equivalent hydrogens are in each molecule shown?
(a) 
Verified step by step guidance1
Identify the molecular structure of the given molecule. Look for symmetry and identical groups within the molecule.
Examine the molecule for any planes of symmetry or rotational symmetry. Equivalent hydrogens are those that are indistinguishable by symmetry.
Consider the chemical environment of each hydrogen atom. Hydrogens in the same chemical environment are equivalent.
Group hydrogens that are in identical environments, such as those attached to the same type of carbon or in similar positions relative to functional groups.
Count the number of distinct groups of equivalent hydrogens. Each group represents a set of equivalent hydrogens.
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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 in terms of their connectivity and spatial arrangement. Identifying equivalent hydrogens is crucial for understanding molecular symmetry and predicting NMR spectra.
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Chemical Environment
The chemical environment of a hydrogen atom refers to the surrounding atoms and the electronic structure that influence its chemical behavior and properties. Factors such as nearby electronegative atoms, hybridization, and steric effects can alter the chemical environment, making hydrogens non-equivalent. Recognizing these environments helps in determining equivalency among hydrogens.
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NMR Spectroscopy
Nuclear Magnetic Resonance (NMR) spectroscopy is a technique used to observe the local magnetic fields around atomic nuclei. In organic chemistry, it is primarily used to identify the number of sets of equivalent hydrogens in a molecule. Each set of equivalent hydrogens produces a distinct signal, allowing chemists to deduce structural information about the molecule.
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Related Practice
Textbook Question
How many sets of equivalent hydrogens are in each molecule shown?
(b)
1272
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Textbook Question
The spectrum shown here is for a molecule with a molecular formula of C₄H₉Cl. Suggest a structure for this molecule.
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1038
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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.
841
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Textbook Question
How many unique ¹H NMR signals would you expect in an NMR spectrum for the following molecules?
(a)
1091
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Textbook Question
Calculate the index of hydrogen deficiency for curacin A, which has a molecular formula of C23H35NOS .
905
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