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-8 17) Chemical Formulae: C₁2H18 4H, Doublet Triplet Triplet Doublet 6 12×2=26-18=812=4 PPM Quartet, 2H Singlet, 9H Triplet, 3H

-8 17) Chemical Formulae: C₁2H18 4H, Doublet Triplet Triplet Doublet 6 12×2=26-18=812=4 PPM Quartet, 2H Singlet, 9H Triplet, 3H

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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### Chemical Analysis and Spectrum Interpretation #### 17) Chemical Formula: C₁₂H₁₈ This section contains an NMR spectrum with several key features, labeled as follows: - **4H, Doublet, Triplet, Triplet, Doublet**: This set of peaks appears between approximately 7 and 8 PPM. These peaks correspond to the presence of hydrogen atoms (H) in the molecule, indicating multiplet configurations due to neighboring hydrogen atoms. - **Quartet, 2H**: Located around 3 PPM, this peak suggests a group of hydrogens in close proximity, influenced by adjacent atoms, resulting in a quartet splitting pattern. - **Singlet, 9H**: Found at roughly 1 PPM, this indicates a group of nine equivalent hydrogen atoms not coupled with any neighboring hydrogens, producing a singlet peak. - **Triplet, 3H**: Appearing near 0.9 PPM, representative of three hydrogens in a triplet configuration due to coupling with neighboring hydrogens. The handwritten note provides a calculation related to the molecular formula: \( 12 \times 2 = 28 - 18 = 8 \frac{1}{2} = 4 \). #### 18) Chemical Formula: C₉H₁₂O In this part, there is a note regarding Infrared Spectroscopy (IR): - **IR: Strong broad peak at 3200 cm⁻¹**: This indicates the presence of a functional group, typically associated with O-H stretching in alcohols or acids, due to the broad nature of the peak. Additionally, a handwritten math note is present: \( 9 \times 2 = 18 + 2 = 20 - 12 = 8 \frac{1}{2} \). This analysis provides insight into the molecular structures represented in the spectra, aiding in the identification of the compounds in question.
Transcribed Image Text:### Chemical Analysis and Spectrum Interpretation #### 17) Chemical Formula: C₁₂H₁₈ This section contains an NMR spectrum with several key features, labeled as follows: - **4H, Doublet, Triplet, Triplet, Doublet**: This set of peaks appears between approximately 7 and 8 PPM. These peaks correspond to the presence of hydrogen atoms (H) in the molecule, indicating multiplet configurations due to neighboring hydrogen atoms. - **Quartet, 2H**: Located around 3 PPM, this peak suggests a group of hydrogens in close proximity, influenced by adjacent atoms, resulting in a quartet splitting pattern. - **Singlet, 9H**: Found at roughly 1 PPM, this indicates a group of nine equivalent hydrogen atoms not coupled with any neighboring hydrogens, producing a singlet peak. - **Triplet, 3H**: Appearing near 0.9 PPM, representative of three hydrogens in a triplet configuration due to coupling with neighboring hydrogens. The handwritten note provides a calculation related to the molecular formula: \( 12 \times 2 = 28 - 18 = 8 \frac{1}{2} = 4 \). #### 18) Chemical Formula: C₉H₁₂O In this part, there is a note regarding Infrared Spectroscopy (IR): - **IR: Strong broad peak at 3200 cm⁻¹**: This indicates the presence of a functional group, typically associated with O-H stretching in alcohols or acids, due to the broad nature of the peak. Additionally, a handwritten math note is present: \( 9 \times 2 = 18 + 2 = 20 - 12 = 8 \frac{1}{2} \). This analysis provides insight into the molecular structures represented in the spectra, aiding in the identification of the compounds in question.
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