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Which of the structures shown below the IR spectrum matches the IR spectrum below. Relative Transmittance 1 0.9 0.8 0.7 0.6 4000 3000 2000 1000

Which of the structures shown below the IR spectrum matches the IR spectrum below. Relative Transmittance 1 0.9 0.8 0.7 0.6 4000 3000 2000 1000

Organic Chemistry: A Guided Inquiry
Organic Chemistry: A Guided Inquiry
2nd Edition
ISBN:9780618974122
Author:Andrei Straumanis
Publisher:Andrei Straumanis
ChapterL4: Proton (1h) Nmr Spectroscopy
Section: Chapter Questions
Problem 21CTQ
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**Infrared Spectroscopy Analysis** **Objective:** Identify which of the structures shown below the IR spectrum matches the IR spectrum provided. **IR Spectrum Analysis:** - **X-Axis (Wavenumber, cm⁻¹):** Ranges from 4000 cm⁻¹ to 500 cm⁻¹. - **Y-Axis (Relative Transmittance):** Ranges from 0 to 1 (100% transmittance). **Key Absorption Bands:** - **Around 3400 cm⁻¹:** Indicates O-H stretch, typically associated with alcohols or phenols. - **Around 3000 cm⁻¹:** Indicates C-H stretch, common in many organic compounds. - **Around 1700 cm⁻¹:** Indicates C=O stretch, typical for ketones, aldehydes, and carboxylic acids. - **Fingerprints region (1500-500 cm⁻¹):** Unique to each molecule, useful for identification. **Structures Provided:** Below the IR spectrum, five different chemical structures (A, B, C, D, and E) are illustrated: - **Structure A:** An aromatic compound with a double bond. - **Structure B:** An alcohol with a benzene ring. - **Structure C:** A long-chain alkane. - **Structure D:** A compound with a carbonyl group. - **Structure E:** An amide with a benzene ring and an OH group. **Match Analysis:** To determine which structure corresponds to the provided IR spectrum, compare the key absorption bands of each structure with those observed in the spectrum. - **Structure A:** Contains an aromatic ring and a double bond, expected to show peaks around 1600 cm⁻¹ and 1500 cm⁻¹ but no broad O-H stretch around 3400 cm⁻¹. - **Structure B:** Contains an OH group (alcohol) and a benzene ring. The broad O-H stretch around 3400 cm⁻¹ and C-H stretches around 3000 cm⁻¹ would fit. - **Structure C:** A long chain alkane usually does not have a broad O-H stretch. - **Structure D:** Features a carbonyl group with no O-H stretch. - **Structure E:** Contains both an amide group and an OH group, which would match the broad O-H stretch, amide I band around 1650 cm
Transcribed Image Text:**Infrared Spectroscopy Analysis** **Objective:** Identify which of the structures shown below the IR spectrum matches the IR spectrum provided. **IR Spectrum Analysis:** - **X-Axis (Wavenumber, cm⁻¹):** Ranges from 4000 cm⁻¹ to 500 cm⁻¹. - **Y-Axis (Relative Transmittance):** Ranges from 0 to 1 (100% transmittance). **Key Absorption Bands:** - **Around 3400 cm⁻¹:** Indicates O-H stretch, typically associated with alcohols or phenols. - **Around 3000 cm⁻¹:** Indicates C-H stretch, common in many organic compounds. - **Around 1700 cm⁻¹:** Indicates C=O stretch, typical for ketones, aldehydes, and carboxylic acids. - **Fingerprints region (1500-500 cm⁻¹):** Unique to each molecule, useful for identification. **Structures Provided:** Below the IR spectrum, five different chemical structures (A, B, C, D, and E) are illustrated: - **Structure A:** An aromatic compound with a double bond. - **Structure B:** An alcohol with a benzene ring. - **Structure C:** A long-chain alkane. - **Structure D:** A compound with a carbonyl group. - **Structure E:** An amide with a benzene ring and an OH group. **Match Analysis:** To determine which structure corresponds to the provided IR spectrum, compare the key absorption bands of each structure with those observed in the spectrum. - **Structure A:** Contains an aromatic ring and a double bond, expected to show peaks around 1600 cm⁻¹ and 1500 cm⁻¹ but no broad O-H stretch around 3400 cm⁻¹. - **Structure B:** Contains an OH group (alcohol) and a benzene ring. The broad O-H stretch around 3400 cm⁻¹ and C-H stretches around 3000 cm⁻¹ would fit. - **Structure C:** A long chain alkane usually does not have a broad O-H stretch. - **Structure D:** Features a carbonyl group with no O-H stretch. - **Structure E:** Contains both an amide group and an OH group, which would match the broad O-H stretch, amide I band around 1650 cm
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