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For the following IR spectra determine if it is consistent with the structure of an alcohol, an alkyne, an alkene, or carbonyl containing molecule mamy imping 1000

For the following IR spectra determine if it is consistent with the structure of an alcohol, an alkyne, an alkene, or carbonyl containing molecule mamy imping 1000

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 Analysis** **Text Description:** For the following IR spectra, determine if it is consistent with the structure of an alcohol, an alkyne, an alkene, or a carbonyl-containing molecule. **Graph/Diagram Explanation:** The graph displayed is an infrared (IR) spectrum that plots transmittance (%) on the y-axis against wavenumber (cm⁻¹) on the x-axis, ranging from 4000 to 500 cm⁻¹. Key features of this spectrum include: - A broad and intense peak around 3400 cm⁻¹, which is indicative of O-H stretching, suggesting the presence of an alcohol. - Sharp peaks near 2100-2200 cm⁻¹, often associated with C≡C stretching in alkynes, but not prominently observed here. - Peaks near 1600 cm⁻¹, which could indicate C=C stretching, typical for alkenes. - A strong peak around 1700 cm⁻¹ is characteristic of C=O stretching in carbonyl groups. The analysis of these specific peaks can help in identifying the functional groups present in the molecule.
Transcribed Image Text:**Infrared (IR) Spectroscopy Analysis** **Text Description:** For the following IR spectra, determine if it is consistent with the structure of an alcohol, an alkyne, an alkene, or a carbonyl-containing molecule. **Graph/Diagram Explanation:** The graph displayed is an infrared (IR) spectrum that plots transmittance (%) on the y-axis against wavenumber (cm⁻¹) on the x-axis, ranging from 4000 to 500 cm⁻¹. Key features of this spectrum include: - A broad and intense peak around 3400 cm⁻¹, which is indicative of O-H stretching, suggesting the presence of an alcohol. - Sharp peaks near 2100-2200 cm⁻¹, often associated with C≡C stretching in alkynes, but not prominently observed here. - Peaks near 1600 cm⁻¹, which could indicate C=C stretching, typical for alkenes. - A strong peak around 1700 cm⁻¹ is characteristic of C=O stretching in carbonyl groups. The analysis of these specific peaks can help in identifying the functional groups present in the molecule.
Below is a transcribed list of molecular types, likely intended for a quiz or educational purpose: - ○ an alcohol - ○ an alkyne - ○ an alkene - ○ carbonyl containing molecule This list appears to be multiple-choice options related to organic chemistry, focusing on different types of molecules identified by characteristic functional groups or bonds. An alcohol contains a hydroxyl (-OH) group, an alkyne features a carbon-carbon triple bond, an alkene has a carbon-carbon double bond, and a carbonyl containing molecule includes a carbon-oxygen double bond, such as in ketones and aldehydes.
Transcribed Image Text:Below is a transcribed list of molecular types, likely intended for a quiz or educational purpose: - ○ an alcohol - ○ an alkyne - ○ an alkene - ○ carbonyl containing molecule This list appears to be multiple-choice options related to organic chemistry, focusing on different types of molecules identified by characteristic functional groups or bonds. An alcohol contains a hydroxyl (-OH) group, an alkyne features a carbon-carbon triple bond, an alkene has a carbon-carbon double bond, and a carbonyl containing molecule includes a carbon-oxygen double bond, such as in ketones and aldehydes.
Expert Solution
Step 1: General stretching frequency

The basic stretching frequency of the given functional groups is 

  • Alcohol: 3600-3200 cm-1, broad peak.
  • Alkyne: A medium peak at 2150 cm-1 of C identical to C.
  • Alkene: A peak at 160p cm-1.
  • Carbonyl compounds: A sharp strong C=O stretching frequency at 1715 cm-1.
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