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In the box provided, write the IR frequency or range of frequencies that would best distinguish between the two compounds shown. Specify which compound (A or B) will display a band at this frequency in its IR spectrum. (Choose the most prominent frequency. Do not include units in your answer. Use only the frequencies listed below. Write the letter of the compound, followed by the range of frequencies, separated by a comma. Example. "A,1600-1850". If there is more than one correct answer, only give one.)

In the box provided, write the IR frequency or range of frequencies that would best distinguish between the two compounds shown. Specify which compound (A or B) will display a band at this frequency in its IR spectrum. (Choose the most prominent frequency. Do not include units in your answer. Use only the frequencies listed below. Write the letter of the compound, followed by the range of frequencies, separated by a comma. Example. "A,1600-1850". If there is more than one correct answer, only give one.)

Chemistry
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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### Infrared (IR) Spectroscopy Absorption Ranges Infrared (IR) spectroscopy is a technique used to identify functional groups in organic compounds by measuring the absorption of IR radiation at different frequencies. The table below lists various types of chemical bonds and their respective IR absorption frequency ranges along with an indication of their intensity. #### IR Absorption Frequencies and Intensities | Functional Group | Frequency Range (cm⁻¹) | Intensity | |-------------------------|------------------------|--------------------| | N-H | 3100-3550 | Medium | | C-H (alkane) | 2850-3000 | Medium | | C-H (alkene) | 3000-3100 | Medium to strong | | C-H (alkyne) | 3300 | Weak to medium | | C≡C | 2100-2250 | Weak | | C=C | 1600-1680 | Weak to medium | | C=O (aldehyde/ketone) | 1630-1820 | Strong | | C=O (ester) | 1735-1800 | Strong | | C=O (carboxylic acid) | 1700-1725 | Strong | | C-O | 1000-1250 | Strong | *Note: The intensities (weak, medium, strong) indicate the relative strength of the absorption band observed in the IR spectrum.* #### How to Use the IR Frequency Range To determine the functional groups present in an organic compound, compare the observed IR absorption frequencies with the ranges provided in the table. You can write down the observed frequency or range of frequencies in the space provided below for further analysis. ``` IR frequency or range of frequencies: ____________ cm⁻¹ ``` #### Example of Usage If an IR spectrum shows a strong absorption at 1710 cm⁻¹, this could indicate the presence of a C=O functional group from a carboxylic acid, as it falls within the 1700-1725 cm⁻¹ range. This table can be a handy reference for students and professionals using IR spectroscopy for chemical analysis and identification.
Transcribed Image Text:### Infrared (IR) Spectroscopy Absorption Ranges Infrared (IR) spectroscopy is a technique used to identify functional groups in organic compounds by measuring the absorption of IR radiation at different frequencies. The table below lists various types of chemical bonds and their respective IR absorption frequency ranges along with an indication of their intensity. #### IR Absorption Frequencies and Intensities | Functional Group | Frequency Range (cm⁻¹) | Intensity | |-------------------------|------------------------|--------------------| | N-H | 3100-3550 | Medium | | C-H (alkane) | 2850-3000 | Medium | | C-H (alkene) | 3000-3100 | Medium to strong | | C-H (alkyne) | 3300 | Weak to medium | | C≡C | 2100-2250 | Weak | | C=C | 1600-1680 | Weak to medium | | C=O (aldehyde/ketone) | 1630-1820 | Strong | | C=O (ester) | 1735-1800 | Strong | | C=O (carboxylic acid) | 1700-1725 | Strong | | C-O | 1000-1250 | Strong | *Note: The intensities (weak, medium, strong) indicate the relative strength of the absorption band observed in the IR spectrum.* #### How to Use the IR Frequency Range To determine the functional groups present in an organic compound, compare the observed IR absorption frequencies with the ranges provided in the table. You can write down the observed frequency or range of frequencies in the space provided below for further analysis. ``` IR frequency or range of frequencies: ____________ cm⁻¹ ``` #### Example of Usage If an IR spectrum shows a strong absorption at 1710 cm⁻¹, this could indicate the presence of a C=O functional group from a carboxylic acid, as it falls within the 1700-1725 cm⁻¹ range. This table can be a handy reference for students and professionals using IR spectroscopy for chemical analysis and identification.
**Distinguishing Between Compounds Using IR Spectrum** In the box provided, write the IR frequency or range of frequencies that would best distinguish between the two compounds shown. Specify which compound (A or B) will display a band at this frequency in its IR spectrum. **Compounds:** - Compound A: Features a chemical structure with a single bond and a triple bond. - Compound B: Features a chemical structure with a single bond and a double bond. **Frequency Table:** | Bond | Stretching Frequency (cm⁻¹) | Intensity | |---------------------|-----------------------------|--------------------| | O-H (alcohol) | 3200-3650 | Medium, broad | | O-H (carboxylic acid)| 2500-3300 | Strong, broad | | N-H | 3100-3550 | Medium | | C-H (alkane) | 2850-3000 | Medium | | C-H (alkene) | 3000-3100 | Medium to strong | | C-H (alkyne) | 3300 | Weak to medium | **Instructions:** 1. Choose the **most prominent frequency**. 2. Do not include units in your answer. 3. Use only the frequencies listed in the table. 4. Write the letter of the compound, followed by the range of frequencies, separated by a comma. For example, if the correct answer for Compound A is in the range "1600-1850", you would write: **"A,1600-1850"**. Note: If there is more than one correct answer, only provide one. **Explanation of Graphs/Diagrams:** - Both diagrams depict chemical structures with different types of bonds. - Diagram for Compound A: Shows a single bond accompanied by a triple bond. - Diagram for Compound B: Shows a single bond accompanied by a double bond. Use the frequency table to determine the specific frequencies at which these bonds will appear in their respective IR spectra.
Transcribed Image Text:**Distinguishing Between Compounds Using IR Spectrum** In the box provided, write the IR frequency or range of frequencies that would best distinguish between the two compounds shown. Specify which compound (A or B) will display a band at this frequency in its IR spectrum. **Compounds:** - Compound A: Features a chemical structure with a single bond and a triple bond. - Compound B: Features a chemical structure with a single bond and a double bond. **Frequency Table:** | Bond | Stretching Frequency (cm⁻¹) | Intensity | |---------------------|-----------------------------|--------------------| | O-H (alcohol) | 3200-3650 | Medium, broad | | O-H (carboxylic acid)| 2500-3300 | Strong, broad | | N-H | 3100-3550 | Medium | | C-H (alkane) | 2850-3000 | Medium | | C-H (alkene) | 3000-3100 | Medium to strong | | C-H (alkyne) | 3300 | Weak to medium | **Instructions:** 1. Choose the **most prominent frequency**. 2. Do not include units in your answer. 3. Use only the frequencies listed in the table. 4. Write the letter of the compound, followed by the range of frequencies, separated by a comma. For example, if the correct answer for Compound A is in the range "1600-1850", you would write: **"A,1600-1850"**. Note: If there is more than one correct answer, only provide one. **Explanation of Graphs/Diagrams:** - Both diagrams depict chemical structures with different types of bonds. - Diagram for Compound A: Shows a single bond accompanied by a triple bond. - Diagram for Compound B: Shows a single bond accompanied by a double bond. Use the frequency table to determine the specific frequencies at which these bonds will appear in their respective IR spectra.
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