Using the attached infrared spectroscopy spectrum for the compound Tetrahydrofuran, identify the functional group and any observed characteristic absorbtions in cm-1. Compare with the attached roadmap for interpreting IR spectra. ### Infrared Spectrum of TetrahydrofuranThis image displays the infrared (IR) spectrum of tetrahydrofuran. The x-axis represents the wavenumber in cm⁻¹, ranging from 4000 to 650 cm⁻¹, while the y-axis represents the percentage of transmittance (%T), which measures how much light passes through the sample.#### Key Features and Peaks:1. **2973.53 and 2857.75 cm⁻¹**: These peaks indicate the presence of C-H stretching vibrations, common in alkane groups. 2. **1459.40 cm⁻¹**: This peak is associated with C-H bending vibrations.3. **1066.48 cm⁻¹**: A strong peak corresponding to the C-O-C stretching vibration, characteristic of the ether group in tetrahydrofuran.4. **907.91 cm⁻¹**: This peak is likely due to out-of-plane C-H bending vibrations.Overall, the spectrum provides a detailed profile of the molecular vibrations in tetrahydrofuran, useful for identifying the compound and understanding its functional groups. ### Infrared Spectroscopy Analysis Guide#### I. Carbonyl Group (C=O) Detection- **Presence Check:** Look for strong absorption at 1750 to 1650 cm⁻¹. - **If Present:** - **Carboxylic Acids:** Broad absorption 3300 to 2500 cm⁻¹ due to O-H stretch. - **Aldehydes:** Two medium peaks at 2780 and 2670 cm⁻¹; one may overlap with aliphatic C-H. - **Amides:** Absorption around 1670 cm⁻¹; peaks in 3050-3550 cm⁻¹ for N-H stretch if not tertiary. - **Further Identification:** - **Anhydrides:** Two peaks in the carbonyl region. - **Ketones/Esters:** Stretching around 1725 cm⁻¹.#### II. Non-Carbonyl Compounds- **N-H Stretching:** - **Primary Amines (R-NH₂):** Two peaks. - **Secondary Amines (R₂-NH):** One peak. - **Tertiary Amines (R₃-N):** No N-H absorption.- **O-H Stretching:** - **Free O-H:** Strong at about 3600 cm⁻¹. - **Hydrogen-bonded O-H:** Broad at about 3400 cm⁻¹.#### III. Triple Bond Detection- **Acetylenes (C≡C):** Stretching band at about 2100-2260 cm⁻¹.- **Nitriles (C≡N):** Similar band at about 2200-2300 cm⁻¹.#### IV. C-H Stretching Regions- **Aliphatic C-H:** Intense absorption around 3030 cm⁻¹.- **Aromatic/Alkene C-H:** Weaker absorption slightly above 3030 cm⁻¹.#### V. Double Bond (C=C) Detection- **Alkenes:** Absorption near 1660 cm⁻¹ (weak).- **Aromatic Benzene Rings:** - Large absorption bands between 650 and 900 cm⁻¹. - Several weak absorptions between 1667 and 2000 cm⁻¹

The structure of tetrahydrofuran is as follows:

Answered: Using the attached infrared…

Chemistry

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ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

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Using the attached infrared spectroscopy spectrum for the compound Tetrahydrofuran, identify the functional group and any observed characteristic absorbtions in cm^-1. Compare with the attached roadmap for interpreting IR spectra.

Transcribed Image Text:### Infrared Spectrum of Tetrahydrofuran This image displays the infrared (IR) spectrum of tetrahydrofuran. The x-axis represents the wavenumber in cm⁻¹, ranging from 4000 to 650 cm⁻¹, while the y-axis represents the percentage of transmittance (%T), which measures how much light passes through the sample. #### Key Features and Peaks: 1. **2973.53 and 2857.75 cm⁻¹**: These peaks indicate the presence of C-H stretching vibrations, common in alkane groups. 2. **1459.40 cm⁻¹**: This peak is associated with C-H bending vibrations. 3. **1066.48 cm⁻¹**: A strong peak corresponding to the C-O-C stretching vibration, characteristic of the ether group in tetrahydrofuran. 4. **907.91 cm⁻¹**: This peak is likely due to out-of-plane C-H bending vibrations. Overall, the spectrum provides a detailed profile of the molecular vibrations in tetrahydrofuran, useful for identifying the compound and understanding its functional groups.

### Infrared Spectroscopy Analysis Guide

#### I. Carbonyl Group (C=O) Detection
- **Presence Check:** Look for strong absorption at 1750 to 1650 cm⁻¹.
- **If Present:**
- **Carboxylic Acids:** Broad absorption 3300 to 2500 cm⁻¹ due to O-H stretch.
- **Aldehydes:** Two medium peaks at 2780 and 2670 cm⁻¹; one may overlap with aliphatic C-H.
- **Amides:** Absorption around 1670 cm⁻¹; peaks in 3050-3550 cm⁻¹ for N-H stretch if not tertiary.
- **Further Identification:**
- **Anhydrides:** Two peaks in the carbonyl region.
- **Ketones/Esters:** Stretching around 1725 cm⁻¹.

#### II. Non-Carbonyl Compounds
- **N-H Stretching:**
- **Primary Amines (R-NH₂):** Two peaks.
- **Secondary Amines (R₂-NH):** One peak.
- **Tertiary Amines (R₃-N):** No N-H absorption.
- **O-H Stretching:**
- **Free O-H:** Strong at about 3600 cm⁻¹.
- **Hydrogen-bonded O-H:** Broad at about 3400 cm⁻¹.

#### III. Triple Bond Detection
- **Acetylenes (C≡C):** Stretching band at about 2100-2260 cm⁻¹.
- **Nitriles (C≡N):** Similar band at about 2200-2300 cm⁻¹.

#### IV. C-H Stretching Regions
- **Aliphatic C-H:** Intense absorption around 3030 cm⁻¹.
- **Aromatic/Alkene C-H:** Weaker absorption slightly above 3030 cm⁻¹.

#### V. Double Bond (C=C) Detection
- **Alkenes:** Absorption near 1660 cm⁻¹ (weak).
- **Aromatic Benzene Rings:**
- Large absorption bands between 650 and 900 cm⁻¹.
- Several weak absorptions between 1667 and 2000 cm⁻¹

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