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NH2 H2N. II IV 200 180 160 140 120 100 80 60 40 20

NH2 H2N. II IV 200 180 160 140 120 100 80 60 40 20

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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Given the NMR spectra, what is the compound?

**Chemical Structures and NMR Spectrum Analysis** This image shows four distinct chemical structures labeled I, II, III, and IV, followed by an NMR spectrum. Let's analyze each component: **Chemical Structures:** 1. **Structure I**: - Aniline derivative with ortho-methyl and para-amino groups. - Chemical formula: C7H9N - Structural features: Benzene ring with NH2 at para position and CH3 at ortho position. 2. **Structure II**: - Aniline derivative with meta-methyl and para-amino groups. - Chemical formula: C7H9N - Structural features: Benzene ring with NH2 at para position and CH3 at meta position. 3. **Structure III**: - Alkylamine with an ethyl chain and an NH group. - Chemical formula: C8H11N - Structural features: Benzene ring with ethylamine substituent. 4. **Structure IV**: - N-ethyl aniline derivative with a para-methyl group. - Chemical formula: C9H13N - Structural features: Benzene ring with an N-ethylmethylamino group. **NMR Spectrum:** The NMR spectrum at the bottom of the image shows several peaks over a chemical shift range of 0-200 ppm. The key spectral details include: - Peaks between 0-50 ppm: Likely represent aliphatic carbons. - Peaks around 120 ppm: Characteristic of aromatic carbons. - Large peak near 140 ppm: Suggests substituted aromatic carbons. This analysis will help students understand the relationship between molecular structure and NMR data, providing insights into interpreting spectral information in organic chemistry.
Transcribed Image Text:**Chemical Structures and NMR Spectrum Analysis** This image shows four distinct chemical structures labeled I, II, III, and IV, followed by an NMR spectrum. Let's analyze each component: **Chemical Structures:** 1. **Structure I**: - Aniline derivative with ortho-methyl and para-amino groups. - Chemical formula: C7H9N - Structural features: Benzene ring with NH2 at para position and CH3 at ortho position. 2. **Structure II**: - Aniline derivative with meta-methyl and para-amino groups. - Chemical formula: C7H9N - Structural features: Benzene ring with NH2 at para position and CH3 at meta position. 3. **Structure III**: - Alkylamine with an ethyl chain and an NH group. - Chemical formula: C8H11N - Structural features: Benzene ring with ethylamine substituent. 4. **Structure IV**: - N-ethyl aniline derivative with a para-methyl group. - Chemical formula: C9H13N - Structural features: Benzene ring with an N-ethylmethylamino group. **NMR Spectrum:** The NMR spectrum at the bottom of the image shows several peaks over a chemical shift range of 0-200 ppm. The key spectral details include: - Peaks between 0-50 ppm: Likely represent aliphatic carbons. - Peaks around 120 ppm: Characteristic of aromatic carbons. - Large peak near 140 ppm: Suggests substituted aromatic carbons. This analysis will help students understand the relationship between molecular structure and NMR data, providing insights into interpreting spectral information in organic chemistry.
### NMR Spectrum Analysis The image shows an NMR (Nuclear Magnetic Resonance) spectrum graph, commonly used in chemistry to determine the structure of organic compounds. #### Graph Details: - **X-Axis**: Labeled "ppm" (parts per million), this represents the chemical shift, which indicates the environment of the hydrogen atoms in the molecule. - **Y-Axis**: Typically represents signal intensity, though not explicitly labeled here. - **Peaks**: There are distinct peaks at approximately 7.5 ppm, 3.5 ppm, and 1.2 ppm. Each peak corresponds to a different type of hydrogen environment in the analyzed compound. #### Multiple Choice Section: - The options below the graph are unlabeled circles with Roman numerals: - ○ I - ○ II - ○ III - ○ IV These options might correspond to possible answers related to the analysis of the NMR spectrum or different compounds potentially being analyzed. This graph serves as a fundamental tool for students and researchers in organic chemistry to infer the structure of molecules based on their hydrogen environments.
Transcribed Image Text:### NMR Spectrum Analysis The image shows an NMR (Nuclear Magnetic Resonance) spectrum graph, commonly used in chemistry to determine the structure of organic compounds. #### Graph Details: - **X-Axis**: Labeled "ppm" (parts per million), this represents the chemical shift, which indicates the environment of the hydrogen atoms in the molecule. - **Y-Axis**: Typically represents signal intensity, though not explicitly labeled here. - **Peaks**: There are distinct peaks at approximately 7.5 ppm, 3.5 ppm, and 1.2 ppm. Each peak corresponds to a different type of hydrogen environment in the analyzed compound. #### Multiple Choice Section: - The options below the graph are unlabeled circles with Roman numerals: - ○ I - ○ II - ○ III - ○ IV These options might correspond to possible answers related to the analysis of the NMR spectrum or different compounds potentially being analyzed. This graph serves as a fundamental tool for students and researchers in organic chemistry to infer the structure of molecules based on their hydrogen environments.
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