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Which of the structures shown below the IR spectrum matches the IR spectrum below.

Which of the structures shown below the IR spectrum matches the IR spectrum below.

Organic Chemistry: A Guided Inquiry
Organic Chemistry: A Guided Inquiry
2nd Edition
ISBN:9780618974122
Author:Andrei Straumanis
Publisher:Andrei Straumanis
ChapterL1: Infrared Spectroscopy
Section: Chapter Questions
Problem 19CTQ
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Whats the answer A, B, C, D or E?

### Infrared (IR) Spectroscopy Analysis Infrared (IR) Spectroscopy is a technique used to identify and study chemicals through the interaction of infrared radiation with matter, particularly the absorption of this radiation by molecular vibrations. The infrared spectrum provided in this exercise helps in determining the molecular structure of the chemical compound by matching absorption peaks with functional groups. #### Exercise: **Question:** Which of the structures shown below the IR spectrum matches the IR spectrum provided above? **IR Spectrum:** The IR spectrum graph shows a plot of % Transmittance (%T) versus Wavenumber (cm⁻¹). Key regions on the spectrum can be noted for identifying functional groups: - A significant absorption around 3000 cm⁻¹ indicating C-H stretching. - Absorptions in the fingerprint region (1500-500 cm⁻¹) providing information on the molecule's specific structure. **Molecules to Compare:** - **Structure A:** Contains a benzene ring with an alkene side chain. - **Structure B:** Contains a benzene ring with a hydroxyl group and an alkane chain. - **Structure C:** An alkane with no distinctive functional groups. - **Structure D:** Contains a carbonyl group (C=O) and branched alkyl groups. - **Structure E:** Contains a carbonyl group (C=O), a double bond in the alkyl chain, and an aromatic ring with a hydroxyl group. **Analysis Steps:** 1. **Identify Key Peaks**: Look for notable peaks corresponding to functional groups: - Around 3400-3200 cm⁻¹ for OH stretching (hydroxyl group). - Around 1700 cm⁻¹ for C=O stretching (carbonyl group). - Between 1600-1500 cm⁻¹ for aromatic C=C stretching. 2. **Compare Structures and Peaks**: - Structure B has an OH group and should show a peak in the 3400-3200 cm⁻¹ region. - Structure D and E should show a strong peak around 1700 cm⁻¹ corresponding to the C=O group. - If the presence of a hydroxyl group is confirmed, only B and E would be likely candidates. **Determine the Match**: Based on the IR spectrum presented, through the process of elimination using the peaks that correspond to specific functional groups, one can determine which molecular structure matches the IR
Transcribed Image Text:### Infrared (IR) Spectroscopy Analysis Infrared (IR) Spectroscopy is a technique used to identify and study chemicals through the interaction of infrared radiation with matter, particularly the absorption of this radiation by molecular vibrations. The infrared spectrum provided in this exercise helps in determining the molecular structure of the chemical compound by matching absorption peaks with functional groups. #### Exercise: **Question:** Which of the structures shown below the IR spectrum matches the IR spectrum provided above? **IR Spectrum:** The IR spectrum graph shows a plot of % Transmittance (%T) versus Wavenumber (cm⁻¹). Key regions on the spectrum can be noted for identifying functional groups: - A significant absorption around 3000 cm⁻¹ indicating C-H stretching. - Absorptions in the fingerprint region (1500-500 cm⁻¹) providing information on the molecule's specific structure. **Molecules to Compare:** - **Structure A:** Contains a benzene ring with an alkene side chain. - **Structure B:** Contains a benzene ring with a hydroxyl group and an alkane chain. - **Structure C:** An alkane with no distinctive functional groups. - **Structure D:** Contains a carbonyl group (C=O) and branched alkyl groups. - **Structure E:** Contains a carbonyl group (C=O), a double bond in the alkyl chain, and an aromatic ring with a hydroxyl group. **Analysis Steps:** 1. **Identify Key Peaks**: Look for notable peaks corresponding to functional groups: - Around 3400-3200 cm⁻¹ for OH stretching (hydroxyl group). - Around 1700 cm⁻¹ for C=O stretching (carbonyl group). - Between 1600-1500 cm⁻¹ for aromatic C=C stretching. 2. **Compare Structures and Peaks**: - Structure B has an OH group and should show a peak in the 3400-3200 cm⁻¹ region. - Structure D and E should show a strong peak around 1700 cm⁻¹ corresponding to the C=O group. - If the presence of a hydroxyl group is confirmed, only B and E would be likely candidates. **Determine the Match**: Based on the IR spectrum presented, through the process of elimination using the peaks that correspond to specific functional groups, one can determine which molecular structure matches the IR
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