### Understanding Spectroscopic Properties of BenzophenoneIn this lesson, we will analyze the spectroscopic properties of benzophenone, a common organic compound, focusing on its infrared (IR) and nuclear magnetic resonance (NMR) spectra, and the influence of resonance stability on its ultraviolet (UV) absorption.#### Problem Statement**Which is not true about the following compound:**![Benzophenone Structure](image_link)#### Answer Options:1. The IR spectrum will show a strong absorption peak around 1680 cm-12. The NMR spectrum will show a group of multiplets around 7 ppm3. Resonance stability enhances its UV absorption4. The IR spectrum will show a medium absorption peak around 2960 cm-1#### Spectroscopic Analysis**1. Infrared (IR) Spectrum:**- **Carbonyl peak (C=O):** Benzophenone contains a carbonyl functional group (C=O). Typically, the carbonyl stretch appears as a strong absorption peak in the region of 1650-1750 cm-1. Therefore, a strong absorption peak around 1680 cm-1 is consistent with this type of compound.- **C-H stretch:** An aromatic C-H stretch typically appears in the range of 3000-3100 cm-1. However, CH2 stretching vibrations can show peaks around 2850-2960 cm-1, but if they are medium, it might not be characteristic of the majority structure of benzophenone, primarily due to lack of CH2 groups.**2. Nuclear Magnetic Resonance (NMR) Spectrum:**- **Aromatic protons:** In the NMR spectrum, aromatic protons typically appear between 6-8 ppm. Given benzophenone's structure, we expect chemical shifts in this range, resulting in multiplets due to the complex splitting pattern of aromatic hydrogens. Therefore, seeing a group of multiplets around 7 ppm fits well with the expected structure.**3. Ultraviolet (UV) Absorption:**- **Resonance stability:** Benzophenone has delocalized π electrons over the aromatic rings and the carbonyl group. This delocalization stabilizes the molecule and enhances its ability to absorb UV light, typically seen around 250-300 nm.

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Which is not true about the following compound: :0 The IR spectrum will show a strong absorption peak around 1680 cm The NMR spectrum will show a group of multiplets around 7 ppm Resonance stability enhances its UV absorption The IR spectrum will show a medium absorption peak around 2960 cm Previous Page Next Page

Which is not true about the following compound: :0 The IR spectrum will show a strong absorption peak around 1680 cm The NMR spectrum will show a group of multiplets around 7 ppm Resonance stability enhances its UV absorption The IR spectrum will show a medium absorption peak around 2960 cm Previous Page Next Page

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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