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¹H-NMR 04 broad singlet, 1H 13 C-NMR 60 triplet, 2H 3 50 CH₂ CH3 CH3-CH-CH₂-CH ₂ - OH CH nonet, 1H 40 C4₂ quartet, 2H 2 PPM PPM 30 20 doublet, 6H 2CH3 10 O

¹H-NMR 04 broad singlet, 1H 13 C-NMR 60 triplet, 2H 3 50 CH₂ CH3 CH3-CH-CH₂-CH ₂ - OH CH nonet, 1H 40 C4₂ quartet, 2H 2 PPM PPM 30 20 doublet, 6H 2CH3 10 O

Chemistry
Chemistry
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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
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This is a liquid unknown compound confirmed to be an alcohol. The IR, mass spec., H-NMR, and C-NMR are below. Analyzing the C-NMR what can be interpreted from the chemical shifts? What can be interpreted from the major peaks in the mass spectrum analysis? I know it’s an alcohol. There is a broad singlet at around 3.6-3.7 ppm, a triplet at 3.5 ppm, a nonet at around 1.8-1.9 ppm, a doublet at 0.9 ppm, and a quartet at around 1.4 ppm. With all this in mind what is this compound, specifically? And how would it be drawn out and relate to the H and C spectra?
### Explanation of NMR Spectra #### ¹H-NMR Spectrum: - **Broad Singlet (1H)** at around 3.65 ppm: This peak is likely due to the presence of an -OH group. - **Triplet (2H)** at approximately 3.45 ppm: Corresponds to a CH₂ group. - **Nonet (1H)** at around 2.8 ppm: This is indicative of a CH group, suggesting a complex splitting pattern due to neighboring hydrogens. - **Quartet (2H)** at about 1.7 ppm: Represents a CH₂ group involved in typical splitting due to adjacent CH₃ groups. - **Doublet (6H)** near 0.8 ppm: Signifies the presence of two equivalent CH₃ groups (denoted as 2CH₃) interacting with neighboring hydrogens. #### ¹³C-NMR Spectrum: - **Chemical Shifts**: There are several peaks, approximately at: - 68 ppm - 34 ppm - 19 ppm - 10 ppm These peaks indicate the various carbon environments in the molecule. The exact nature of these carbon atoms would be elucidated by considering the molecular structure along with the observed chemical shifts. ### Understanding NMR Spectra Both spectra provide insights into the molecular structure by showing how hydrogen and carbon atoms in a molecule interact with an external magnetic field. The number, position, and splitting of the peaks help determine the molecular geometry and functional groups present.
Transcribed Image Text:### Explanation of NMR Spectra #### ¹H-NMR Spectrum: - **Broad Singlet (1H)** at around 3.65 ppm: This peak is likely due to the presence of an -OH group. - **Triplet (2H)** at approximately 3.45 ppm: Corresponds to a CH₂ group. - **Nonet (1H)** at around 2.8 ppm: This is indicative of a CH group, suggesting a complex splitting pattern due to neighboring hydrogens. - **Quartet (2H)** at about 1.7 ppm: Represents a CH₂ group involved in typical splitting due to adjacent CH₃ groups. - **Doublet (6H)** near 0.8 ppm: Signifies the presence of two equivalent CH₃ groups (denoted as 2CH₃) interacting with neighboring hydrogens. #### ¹³C-NMR Spectrum: - **Chemical Shifts**: There are several peaks, approximately at: - 68 ppm - 34 ppm - 19 ppm - 10 ppm These peaks indicate the various carbon environments in the molecule. The exact nature of these carbon atoms would be elucidated by considering the molecular structure along with the observed chemical shifts. ### Understanding NMR Spectra Both spectra provide insights into the molecular structure by showing how hydrogen and carbon atoms in a molecule interact with an external magnetic field. The number, position, and splitting of the peaks help determine the molecular geometry and functional groups present.
## IR Spectrum Analysis The infrared (IR) spectrum presented shows transmittance on the y-axis and wavenumbers (cm⁻¹) on the x-axis, ranging from 4000 to 500 cm⁻¹. Key features of the spectrum include: - A broad absorption around 3400 cm⁻¹, likely indicating the presence of O-H stretching, typically associated with alcohols or phenols. - Other notable peaks and patterns across the spectrum suggest various functional groups, including possible C-H, C=O, and C-O bonds. ## Mass Spectrometry (Mass Spec.) Analysis The mass spectrum graph displays relative intensity on the y-axis and mass-to-charge ratio (m/z) on the x-axis, ranging from 0 to 100. Significant peaks are observed at: - m/z = 31 - m/z = 42 - m/z = 55 - m/z = 70 - A major peak at m/z = 88, labeled with M⁺, indicating the molecular ion peak and representing the molecular weight of the compound being analyzed. These peaks correspond to fragments of the molecule, helping to determine the molecular structure by analyzing the pattern and intensity of the ions.
Transcribed Image Text:## IR Spectrum Analysis The infrared (IR) spectrum presented shows transmittance on the y-axis and wavenumbers (cm⁻¹) on the x-axis, ranging from 4000 to 500 cm⁻¹. Key features of the spectrum include: - A broad absorption around 3400 cm⁻¹, likely indicating the presence of O-H stretching, typically associated with alcohols or phenols. - Other notable peaks and patterns across the spectrum suggest various functional groups, including possible C-H, C=O, and C-O bonds. ## Mass Spectrometry (Mass Spec.) Analysis The mass spectrum graph displays relative intensity on the y-axis and mass-to-charge ratio (m/z) on the x-axis, ranging from 0 to 100. Significant peaks are observed at: - m/z = 31 - m/z = 42 - m/z = 55 - m/z = 70 - A major peak at m/z = 88, labeled with M⁺, indicating the molecular ion peak and representing the molecular weight of the compound being analyzed. These peaks correspond to fragments of the molecule, helping to determine the molecular structure by analyzing the pattern and intensity of the ions.
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