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11 10 9 8 7 6 ppm 1H1H 5 4 2Н 3 ЗН 2 О

11 10 9 8 7 6 ppm 1H1H 5 4 2Н 3 ЗН 2 О

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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An unknown compound has a molecular formula of C5H7N. Its IR spectrum shows a signal at 3070, 2250, and 1690 cm-1. It’s 1H NMR and 13C NMR spectra are shown below. Draw the structure of this unknown compound.
This image is a Carbon-13 Nuclear Magnetic Resonance (NMR) spectrum. The horizontal axis represents the chemical shift in parts per million (ppm), ranging from 0 to 220 ppm. In the spectrum: 1. There are four distinct peaks at approximately 20 ppm, 40 ppm, 120 ppm, and 140 ppm. 2. Each peak corresponds to a different carbon environment in the molecule being analyzed. This type of spectrum is useful for identifying the structure of organic compounds by revealing the electronic environment of carbon atoms within a molecule. The specific positions and number of peaks can help deduce the molecular framework.
Transcribed Image Text:This image is a Carbon-13 Nuclear Magnetic Resonance (NMR) spectrum. The horizontal axis represents the chemical shift in parts per million (ppm), ranging from 0 to 220 ppm. In the spectrum: 1. There are four distinct peaks at approximately 20 ppm, 40 ppm, 120 ppm, and 140 ppm. 2. Each peak corresponds to a different carbon environment in the molecule being analyzed. This type of spectrum is useful for identifying the structure of organic compounds by revealing the electronic environment of carbon atoms within a molecule. The specific positions and number of peaks can help deduce the molecular framework.
The image shows an NMR (Nuclear Magnetic Resonance) spectrum, which is a tool used to determine the structure of organic compounds by analyzing the magnetic environment of hydrogen atoms in a molecule. ### Description of the Spectrum: - The x-axis is labeled "ppm," which stands for parts per million, a unit used to describe the chemical shift. This chemical shift indicates the different environments of hydrogen atoms in the molecule. - The spectrum displays several peaks, each corresponding to distinct hydrogen environments: - **Peak at approximately 1 ppm:** Labeled "3 H", indicating that there are three equivalent hydrogen atoms contributing to this peak. This is typical for methyl groups (CH₃). - **Peak at approximately 2 ppm:** Labeled "2 H", suggesting two equivalent hydrogen atoms, often indicative of methylene groups (CH₂) adjacent to electronegative groups. - **Peaks around 5 ppm:** Labeled "1 H" each, suggesting two distinct yet closely related hydrogen environments, as often seen in alkenic groups or groups near oxygen atoms. ### Inset Detail: - There is an inset magnifying a complex splitting pattern, which suggests coupling between neighboring hydrogen atoms. Each split peak corresponds to the magnetic interaction between these hydrogens, providing insights into the molecular structure. ### Educational Insight: Understanding NMR spectra involves interpreting the number of peaks (indicative of unique hydrogen environments), their position (chemical shift), and splitting patterns (coupling with neighboring hydrogens). Through this analysis, one can deduce the structure of the molecule in question.
Transcribed Image Text:The image shows an NMR (Nuclear Magnetic Resonance) spectrum, which is a tool used to determine the structure of organic compounds by analyzing the magnetic environment of hydrogen atoms in a molecule. ### Description of the Spectrum: - The x-axis is labeled "ppm," which stands for parts per million, a unit used to describe the chemical shift. This chemical shift indicates the different environments of hydrogen atoms in the molecule. - The spectrum displays several peaks, each corresponding to distinct hydrogen environments: - **Peak at approximately 1 ppm:** Labeled "3 H", indicating that there are three equivalent hydrogen atoms contributing to this peak. This is typical for methyl groups (CH₃). - **Peak at approximately 2 ppm:** Labeled "2 H", suggesting two equivalent hydrogen atoms, often indicative of methylene groups (CH₂) adjacent to electronegative groups. - **Peaks around 5 ppm:** Labeled "1 H" each, suggesting two distinct yet closely related hydrogen environments, as often seen in alkenic groups or groups near oxygen atoms. ### Inset Detail: - There is an inset magnifying a complex splitting pattern, which suggests coupling between neighboring hydrogen atoms. Each split peak corresponds to the magnetic interaction between these hydrogens, providing insights into the molecular structure. ### Educational Insight: Understanding NMR spectra involves interpreting the number of peaks (indicative of unique hydrogen environments), their position (chemical shift), and splitting patterns (coupling with neighboring hydrogens). Through this analysis, one can deduce the structure of the molecule in question.
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