### Infrared (IR) Spectroscopy Analysis**4.** The following IR spectrum comes from either an aldehyde or a ketone. Which is it? ______![IR Spectrum](image)The graph above is an IR (Infrared) spectrum that displays various absorption bands which correspond to different vibrational modes of the molecular bonds within the compound being examined. Here is a detailed breakdown of the key absorption bands and their corresponding wavenumbers:- **3044 cm⁻¹:** Indicates the presence of aromatic C-H stretching.- **2923 cm⁻¹:** Corresponds to aliphatic C-H stretching vibrations.- **2734 cm⁻¹:** This peak is characteristic of aldehyde C-H stretching, which helps to distinguish between aldehydes and ketones, the latter of which typically do not show this absorption band.- **1704 cm⁻¹:** Indicates the presence of C=O (carbonyl) stretching vibration, which is common in both aldehydes and ketones.- **1608 cm⁻¹:** Typically associated with aromatic ring stretching, indicating an aryl (aromatic) group in the compound.- **1450 cm⁻¹ and 1388 cm⁻¹:** These bands are due to C-H bending vibrations. - **810 cm⁻¹:** Often associated with out-of-plane bending vibrations of aromatic C-H bonds.Based on the presence of the absorption band at 2734 cm⁻¹, it suggests that the compound is more likely an aldehyde rather than a ketone.**Additionally, is this compound “aryl”, “alkyl”, or both? ______**Considering the presence of bands at 3044 cm⁻¹ and 1608 cm⁻¹, which are indicative of aromatic C-H stretching and aromatic ring stretching respectively, this compound contains an aryl (aromatic) group. The absorption bands at 2923 cm⁻¹ and 1450 cm⁻¹/1388 cm⁻¹ point towards the presence of alkyl C-H stretching and bending. Hence, the compound contains both aryl and alkyl groups.### Conclusion- **Type of Compound:** Aldehyde- **Nature of Groups Present:** Both aryl and alkyl groups

3044 cm-1 - C–H stretch aromatics 2923 cm-1 - C–H stretch alkanes 2734…

Answered: 4. The following IR comes from EITHER…

4. The following IR comes from EITHER and aldehyde or a ketone, Which is it? LOL

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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