**Anthracene Infrared Spectrum Analysis****Graph Explanation:**The image shows the infrared (IR) spectrum of anthracene. The x-axis represents the wavenumber in cm⁻¹, ranging from 4000 to 500, while the y-axis represents the relative transmittance.**Key Features:**- The spectrum exhibits several sharp peaks, indicating vibrational transitions.- Major peaks can be observed around 3050 cm⁻¹ and between 700-900 cm⁻¹, which are characteristic of aromatic C-H stretching and bending vibrations, respectively.**Tasks:**1. **Interpretation of the IR Spectrum:** - Identify the structure of the organic molecule using the IR spectrum. - Determine the characteristic peaks present in the spectrum.2. **IR, NMR, and Mass Spectra for Methyl Ethyl Ester:** - Draw the IR, NMR, and mass spectra for methyl ethyl ester.3. **IR, NMR, and Mass Spectra for Acetyl Salicylic Acid (Aspirin):** - Draw the IR, NMR, and mass spectra for acetyl salicylic acid, commonly known as aspirin.For further details, refer to the NIST Chemistry WebBook: [NIST Chemistry WebBook](https://webbook.nist.gov/chemistry/).

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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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**Anthracene Infrared Spectrum Analysis**

**Graph Explanation:**
The image shows the infrared (IR) spectrum of anthracene. The x-axis represents the wavenumber in cm⁻¹, ranging from 4000 to 500, while the y-axis represents the relative transmittance.

**Key Features:**
- The spectrum exhibits several sharp peaks, indicating vibrational transitions.
- Major peaks can be observed around 3050 cm⁻¹ and between 700-900 cm⁻¹, which are characteristic of aromatic C-H stretching and bending vibrations, respectively.

**Tasks:**
1. **Interpretation of the IR Spectrum:**
- Identify the structure of the organic molecule using the IR spectrum.
- Determine the characteristic peaks present in the spectrum.

2. **IR, NMR, and Mass Spectra for Methyl Ethyl Ester:**
- Draw the IR, NMR, and mass spectra for methyl ethyl ester.

3. **IR, NMR, and Mass Spectra for Acetyl Salicylic Acid (Aspirin):**
- Draw the IR, NMR, and mass spectra for acetyl salicylic acid, commonly known as aspirin.

For further details, refer to the NIST Chemistry WebBook: [NIST Chemistry WebBook](https://webbook.nist.gov/chemistry/).

Expert Solution

Step 1

In the IR spectra we can distinctly see the following peaks i.e at 3050cm^-1, 1600cm^-1, 900cm^-1, 730cm^-1.

The IR peak at 3050cm^-1 may appear for aromatic C-H stretching. The range of aromatic C-H stretching frequency lies in between 3000-3100cm^-1. Peak for no other functional group falls in this region.

A sharp but weak peak is also observed at 1600cm^-1 from which we can say the presence of C=C functionality. As C=C stretching frequency appears in the region of 1600-1680cm^-1. Hence the compound is aromatic but C=C stretching frequency is very weak. The compound may have very low resonance energy compared to benzene.

The peaks at 900 and 730cm^-1 arise due to aromatic bending. (In plane and out of plane C-H bending appear at 900cm^-1 and 730cm^-1 respectively).

No other characteristic peaks are observed. So it is clear from the above data that this a aromatic hydrocarbon.

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