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a a b с d f Label the following proton sets by their number and multiplicity, e.g. proton set a is a nine hydrogen singlet (9H,singlet). i) Proton set b is a ii) Proton set e is a iii) Proton set f is a

a a b с d f Label the following proton sets by their number and multiplicity, e.g. proton set a is a nine hydrogen singlet (9H,singlet). i) Proton set b is a ii) Proton set e is a iii) Proton set f is a

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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### Understanding Proton Sets in NMR Spectroscopy On this page, we will explore the concept of proton sets in NMR (Nuclear Magnetic Resonance) spectroscopy using an example molecule. Each proton set is labeled and needs to be classified by the number of protons it represents as well as its multiplicity. Here is how to understand and label proton sets according to number and multiplicity. ### Example Molecule and Proton Sets Below is the structure of a molecule with labeled proton sets: ``` f | –CH3 | e | –CH2 | c O | || –CH–CH–C– | b | | a |–CH3 | –CH3 | –CH3 ``` #### Assignments: 1. **Proton set b:** - These protons are typically influenced by neighboring protons on adjacent carbons and need to be identified by their coupling pattern. 2. **Proton set e:** - These protons are part of a methylene (CH2) group. Their multiplicity will depend on the interaction with neighboring protons. 3. **Proton set f:** - These protons are part of a methyl (CH3) group. They generally appear as singles or doublets depending on nearby protons. ### Tasks 1. **Proton set b:** - Identify the number of protons and their multiplicity. 2. **Proton set e:** - Determine the number of protons and multiplicity associated with this group. 3. **Proton set f:** - Classify this set by the number of protons and multiplicity. #### Questions: i) Proton set b is a ____________ ii) Proton set e is a ____________ iii) Proton set f is a ____________ ### Explanation of Concepts: - **Multiplicity (n+1 Rule):** This rule states that the number of peaks is one more than the number of neighboring hydrogen atoms. - **Singlet:** A peak with no splitting (n=0). - **Doublet:** A peak split into two (n=1). - **Triplet:** A peak split into three (n=2). - **Quartet:** A peak split into four (n=3). - **Multiplicity combined with Numbers:** Protons can be represented as singlets, double
Transcribed Image Text:### Understanding Proton Sets in NMR Spectroscopy On this page, we will explore the concept of proton sets in NMR (Nuclear Magnetic Resonance) spectroscopy using an example molecule. Each proton set is labeled and needs to be classified by the number of protons it represents as well as its multiplicity. Here is how to understand and label proton sets according to number and multiplicity. ### Example Molecule and Proton Sets Below is the structure of a molecule with labeled proton sets: ``` f | –CH3 | e | –CH2 | c O | || –CH–CH–C– | b | | a |–CH3 | –CH3 | –CH3 ``` #### Assignments: 1. **Proton set b:** - These protons are typically influenced by neighboring protons on adjacent carbons and need to be identified by their coupling pattern. 2. **Proton set e:** - These protons are part of a methylene (CH2) group. Their multiplicity will depend on the interaction with neighboring protons. 3. **Proton set f:** - These protons are part of a methyl (CH3) group. They generally appear as singles or doublets depending on nearby protons. ### Tasks 1. **Proton set b:** - Identify the number of protons and their multiplicity. 2. **Proton set e:** - Determine the number of protons and multiplicity associated with this group. 3. **Proton set f:** - Classify this set by the number of protons and multiplicity. #### Questions: i) Proton set b is a ____________ ii) Proton set e is a ____________ iii) Proton set f is a ____________ ### Explanation of Concepts: - **Multiplicity (n+1 Rule):** This rule states that the number of peaks is one more than the number of neighboring hydrogen atoms. - **Singlet:** A peak with no splitting (n=0). - **Doublet:** A peak split into two (n=1). - **Triplet:** A peak split into three (n=2). - **Quartet:** A peak split into four (n=3). - **Multiplicity combined with Numbers:** Protons can be represented as singlets, double
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