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1) Draw the structure of your unknown below and ussign the spectrum. That is, label each different peak in the spoctrum with a letter (eg, a, b, c, etc.) and place the letter on the structure you drew near the hydrogens or sets of hydrogens responsible for the peak. See the course pack for a discussion of how to "assign' u spectrum und a worked exumple.

1) Draw the structure of your unknown below and ussign the spectrum. That is, label each different peak in the spoctrum with a letter (eg, a, b, c, etc.) and place the letter on the structure you drew near the hydrogens or sets of hydrogens responsible for the peak. See the course pack for a discussion of how to "assign' u spectrum und a worked exumple.

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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**Lab Section:** __________________ **Name:** __________________ --- # Write-Up Sheet for Proton NMR Spectroscopy Experiment ## DATA & ANALYSIS **Unknown Number:** ____________________ Attach the unknown ¹H NMR spectrum you were assigned to this sheet. --- ### QUESTIONS 1) Draw the structure of your unknown below and assign the spectrum. That is, label each different peak in the spectrum with a letter (e.g. a, b, c, etc.) and place the letter on the structure you drew near the hydrogens or sets of hydrogens responsible for the peak. See the course pack for a discussion of how to "assign" a spectrum and a worked example. This document serves as a worksheet for students conducting proton NMR spectroscopy experiments. Students are expected to draw and label the structures of assigned unknown compounds, correlate the peaks in the NMR spectrum with specific hydrogen atoms or groups of hydrogen atoms in their structure, and learn the process of spectral assignment through practical application.
Transcribed Image Text:**Lab Section:** __________________ **Name:** __________________ --- # Write-Up Sheet for Proton NMR Spectroscopy Experiment ## DATA & ANALYSIS **Unknown Number:** ____________________ Attach the unknown ¹H NMR spectrum you were assigned to this sheet. --- ### QUESTIONS 1) Draw the structure of your unknown below and assign the spectrum. That is, label each different peak in the spectrum with a letter (e.g. a, b, c, etc.) and place the letter on the structure you drew near the hydrogens or sets of hydrogens responsible for the peak. See the course pack for a discussion of how to "assign" a spectrum and a worked example. This document serves as a worksheet for students conducting proton NMR spectroscopy experiments. Students are expected to draw and label the structures of assigned unknown compounds, correlate the peaks in the NMR spectrum with specific hydrogen atoms or groups of hydrogen atoms in their structure, and learn the process of spectral assignment through practical application.
## Hydrogen Nuclear Magnetic Resonance (H-NMR) Spectrum of Unknown #25 (C₁₀H₁₂O) ### Overview This H-NMR spectrum corresponds to an unknown compound with the molecular formula C₁₀H₁₂O. The graph highlights the chemical shift, measured in parts per million (ppm), along with the integration and splitting patterns of the hydrogen atoms. ### Key Features of the Spectrum: 1. **Peak at ~7.1-7.9 ppm (2H each)** - **Description:** There are multiplet peaks in the region between 7.1 and 7.9 ppm. - **Protons:** These peaks correspond to four hydrogen atoms (2H each peak). - **Interpretation:** The chemical shifts in this region typically indicate the presence of aromatic hydrogens, which are hydrogens attached to a benzene ring. 2. **Peak at ~2.5-2.8 ppm (2H Quartet)** - **Description:** A quartet peak is observed around 2.5 to 2.8 ppm. - **Protons:** This peak corresponds to two hydrogen atoms. - **Interpretation:** This chemical shift is indicative of hydrogens adjacent to a deshielding group, likely in a region adjacent to an oxygen atom or double bond. 3. **Peak at ~1.1 ppm (3H Triplet)** - **Description:** A triplet peak is observed around 1.1 ppm. - **Protons:** This peak corresponds to three hydrogen atoms. - **Interpretation:** This shift typically indicates the presence of a methyl group (CH₃). The triplet pattern suggests that these hydrogens are next to a CH₂ group. 4. **Peak at ~2.1 ppm (3H Singlet)** - **Description:** There is a singlet peak around 2.1 ppm. - **Protons:** This peak corresponds to three hydrogen atoms. - **Interpretation:** This chemical shift and singlet pattern often indicate the presence of methyl hydrogens adjacent to an oxygen or double bond (such as CH₃ adjacent to a carbonyl group). ### Analysis From the spectrum, one can deduce that the compound contains: - Aromatic hydrogen atoms (~7.1-7.9 ppm). - A CH₂ group adjacent to a des
Transcribed Image Text:## Hydrogen Nuclear Magnetic Resonance (H-NMR) Spectrum of Unknown #25 (C₁₀H₁₂O) ### Overview This H-NMR spectrum corresponds to an unknown compound with the molecular formula C₁₀H₁₂O. The graph highlights the chemical shift, measured in parts per million (ppm), along with the integration and splitting patterns of the hydrogen atoms. ### Key Features of the Spectrum: 1. **Peak at ~7.1-7.9 ppm (2H each)** - **Description:** There are multiplet peaks in the region between 7.1 and 7.9 ppm. - **Protons:** These peaks correspond to four hydrogen atoms (2H each peak). - **Interpretation:** The chemical shifts in this region typically indicate the presence of aromatic hydrogens, which are hydrogens attached to a benzene ring. 2. **Peak at ~2.5-2.8 ppm (2H Quartet)** - **Description:** A quartet peak is observed around 2.5 to 2.8 ppm. - **Protons:** This peak corresponds to two hydrogen atoms. - **Interpretation:** This chemical shift is indicative of hydrogens adjacent to a deshielding group, likely in a region adjacent to an oxygen atom or double bond. 3. **Peak at ~1.1 ppm (3H Triplet)** - **Description:** A triplet peak is observed around 1.1 ppm. - **Protons:** This peak corresponds to three hydrogen atoms. - **Interpretation:** This shift typically indicates the presence of a methyl group (CH₃). The triplet pattern suggests that these hydrogens are next to a CH₂ group. 4. **Peak at ~2.1 ppm (3H Singlet)** - **Description:** There is a singlet peak around 2.1 ppm. - **Protons:** This peak corresponds to three hydrogen atoms. - **Interpretation:** This chemical shift and singlet pattern often indicate the presence of methyl hydrogens adjacent to an oxygen or double bond (such as CH₃ adjacent to a carbonyl group). ### Analysis From the spectrum, one can deduce that the compound contains: - Aromatic hydrogen atoms (~7.1-7.9 ppm). - A CH₂ group adjacent to a des
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