### NMR Signal Analysis**Objective:**Determine the number of signals expected in the \( ^1H \) and \( ^{13}C \) NMR spectra for each molecule.---#### Molecules and Expected Signals1. **Hexanal (tutti-frutti aroma):** - **Structure:** Linear aliphatic aldehyde with six carbon atoms. - **\( ^1H \) NMR Signals:** - Consider each unique hydrogen environment along the carbon chain. - **\( ^{13}C \) NMR Signals:** - Account for each unique carbon atom environment including the aldehyde carbon.2. **Ethyl p-anisate (licorice aroma):** - **Structure:** Aromatic compound with methoxy and ester groups attached to a benzene ring. - **\( ^1H \) NMR Signals:** - Analyze different proton environments within the aromatic ring, methoxy, and ethyl group. - **\( ^{13}C \) NMR Signals:** - Distinguish between carbon environments in the aromatic ring, ester group, and side chains.3. **Diacetyl (buttered popcorn aroma):** - **Structure:** Di-ketone with a linear arrangement. - **\( ^1H \) NMR Signals:** - Evaluate the number of unique proton environments in the molecule. - **\( ^{13}C \) NMR Signals:** - Identify distinct carbon environments including both carbonyl carbons.---**Note:** In \( ^1H \) NMR, the number of signals corresponds to unique proton environments, while in \( ^{13}C \) NMR, it corresponds to unique carbon environments. Consider symmetry and equivalent groups when assessing signal count.

The number of signals in 1H-NMR gives information about the number of different types of hydrogen atoms present in the molecule. The number of signals in 13C-NMR gives information about the number of different types of carbon atoms present in the molecule.The number of different carbon atom in hexanal is six hence it gives six signals in the 13C-NMR spectrum and it has six different types of hydrogen atom hence the number of signals in 1H-NMR is also six.The number of different carbon atom in ethyl p-anisate is eight hence it gives eight signals in the 13C-NMR spectrum and it has five different types of hydrogen atom hence the number of signals in 1H-NMR is five.The number of different carbon atom in diacetyl is two hence it gives two signals in the 13C-NMR spectrum and it has only one type of hydrogen atom hence the number of signals in 1H-NMR is one.

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3. How many signals would you expect in the 'H and 13C NMR spectrum of each molecule? H. ethyl p-anisate (licorice) hexanal diacetyl (buttered popcorn) (tutti-fruitti) 13C 1H 13C 1H 13C

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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