**CHEM 238****Discussion Questions – Aldehydes and Ketones**---**Image Explanation:**The given image contains two Nuclear Magnetic Resonance (NMR) spectroscopy graphs, labeled as 2 and 3, which are used for analyzing aldehyde and ketone compounds.**Graph 2**:- **X-axis:** Chemical shift (PPM, Parts Per Million) ranging from 0 to 9.- **Peaks:** Multiple small peaks observed around 7 to 9 PPM with a significant sharp peak around 2 PPM. The presence of peaks in the 7 to 9 PPM range is typical for aromatic protons, often found in aldehydes and ketones, and the peak at 2 PPM may indicate protons adjacent to a carbonyl group.**Graph 3**:- **X-axis:** Chemical shift (PPM) ranging from 0 to 16.- **Peaks:** Notable peaks appearing at approximately 2, 8, and 14 PPM. The peak around 14 PPM could indicate a proton in a highly deshielded environment, possibly associated with an aldehyde proton.These graphs are used for identifying the structure and environment of hydrogen atoms in aldehyde and ketone compounds through their unique chemical shifts. This image presents a table and structural diagrams for an educational chemistry experiment involving the identification of compounds based on chemical tests and NMR spectroscopy.**Structural Diagrams:**- **Compound A** is a molecule with a phenyl group attached to a carbonyl group, leading to an acetophenone structure.- **Compound B** features a more complex aliphatic structure with a ketone group.- **Compound C** consists of a benzaldehyde structure with an alcohol group.**Table Description:**| **Test** | **Compound A** | **Compound B** | **Compound C** ||-------------------|------------------------|------------------------|-----------------------|| **Tollens’ Test** | positive | negative | positive || **Schiff’s Test** | immediate color change | slow color change | slow color change || **Iodoform Test** | negative | positive | negative || **¹H NMR** | spectrum 1 | spectrum 2 | spectrum 3 || **Compound** | | | |**Graph Explanation:**The NMR spectrum labeled "1" below the table displays the following:- The x-axis represents the chemical shift (δ) values in parts per million (ppm).- The y-axis represents the intensity of the signals.- The spectrum shows multiple peaks indicating different hydrogen environments in the molecule.### How to Use this Table and Spectral Data:- Apply the results from the Tollens' Test, Schiff’s Test, and Iodoform Test to narrow down the functional groups present in the unknown compounds.- Analyze the NMR spectrum to further elucidate the structure by examining the splitting patterns, integrations, and chemical shifts. By combining qualitative test data with the NMR spectral data, students can logically deduce the identity of each compound within the experiment.

NMR spectroscopy is used for the determination of the structure with incorporating the interaction…

compound that matches. Tollens' Test positive negative positive CH3 Schiff's Test immediate color change slow color change slow color لله CH3 Iodoform Test negative positive negative B spectrum 1 spectrum 2 spectrum 3 CH3 CH3 ¹H NMR lete the table by identifying the OH Compound

compound that matches. Tollens' Test positive negative positive CH3 Schiff's Test immediate color change slow color change slow color لله CH3 Iodoform Test negative positive negative B spectrum 1 spectrum 2 spectrum 3 CH3 CH3 ¹H NMR lete the table by identifying the OH Compound

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter16: Synthesis Workshop 1

Section: Chapter Questions

Problem 25CTQ

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This image presents a table and structural diagrams for an educational chemistry experiment involving the identification of compounds based on chemical tests and NMR spectroscopy.

**Structural Diagrams:**
- **Compound A** is a molecule with a phenyl group attached to a carbonyl group, leading to an acetophenone structure.
- **Compound B** features a more complex aliphatic structure with a ketone group.
- **Compound C** consists of a benzaldehyde structure with an alcohol group.

**Table Description:**

| **Test** | **Compound A** | **Compound B** | **Compound C** |
|-------------------|------------------------|------------------------|-----------------------|
| **Tollens’ Test** | positive | negative | positive |
| **Schiff’s Test** | immediate color change | slow color change | slow color change |
| **Iodoform Test** | negative | positive | negative |
| **¹H NMR** | spectrum 1 | spectrum 2 | spectrum 3 |
| **Compound** | | | |

**Graph Explanation:**

The NMR spectrum labeled "1" below the table displays the following:

- The x-axis represents the chemical shift (δ) values in parts per million (ppm).
- The y-axis represents the intensity of the signals.
- The spectrum shows multiple peaks indicating different hydrogen environments in the molecule.

### How to Use this Table and Spectral Data:
- Apply the results from the Tollens' Test, Schiff’s Test, and Iodoform Test to narrow down the functional groups present in the unknown compounds.
- Analyze the NMR spectrum to further elucidate the structure by examining the splitting patterns, integrations, and chemical shifts.

By combining qualitative test data with the NMR spectral data, students can logically deduce the identity of each compound within the experiment.

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Step 1: NMR spectroscopy

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Step 2: Special tests for detection of functional groups

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Step 3: NMR spectrum of A

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Step 4: NMR interpretation of A

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Step 5: NMR spectrum of B

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Step 6: NMR interpretation of B

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Step 7: NMR spectrum of C

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Step 8: NMR interpretation of C

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