Question

Four infrared spectra are shown, corresponding to four of the following compounds. For each spectrum, determine the structure and explain how the peaks in the spectrum correspond to the structure you have chosen.

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Accepted Answer

Step 1: Analyze the IR spectrum labeled (a). Look for key peaks such as a broad absorption around 3200-3600 cm⁻¹, which indicates the presence of an O-H stretch (alcohol or carboxylic acid). Additionally, check for a sharp peak near 1700 cm⁻¹, which corresponds to a C=O stretch (carbonyl group). These features suggest the compound may be a carboxylic acid. Step 2: Analyze the IR spectrum labeled (b). Identify the broad absorption around 3200-3600 cm⁻¹, which indicates an O-H stretch. Look for the absence of a sharp peak near 1700 cm⁻¹, which would rule out a carbonyl group. This spectrum likely corresponds to an alcohol. Step 3: Analyze the IR spectrum labeled (c). Look for sharp peaks near 1600 cm⁻¹ and 1500 cm⁻¹, which are characteristic of aromatic C=C stretches. Additionally, check for a broad absorption around 3200-3600 cm⁻¹, indicating an O-H stretch. These features suggest the compound is a phenol. Step 4: Analyze the IR spectrum labeled (d). Look for a sharp peak near 1700 cm⁻¹, which indicates a C=O stretch (carbonyl group). Check for the absence of a broad absorption around 3200-3600 cm⁻¹, ruling out an O-H stretch. This spectrum likely corresponds to a ketone. Step 5: Match each IR spectrum to the provided chemical structures based on the functional groups identified. For example, spectrum (a) corresponds to a carboxylic acid, spectrum (b) to an alcohol, spectrum (c) to a phenol, and spectrum (d) to a ketone. Use the chemical structures provided in the first image to finalize the matches.

Four infrared spectra are shown, corresponding to four of the following compounds. For each spectrum, determine the structure and explain how the peaks in the spectrum correspond to the structure you have chosen.

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Verified video answer for a similar problem:

Key Concepts

Infrared Spectroscopy

Functional Groups

Peak Interpretation

Four infrared spectra are shown, corresponding to four of the following compounds. For each spectrum, determine the structure and explain how the peaks in the spectrum correspond to the structure you have chosen.<IMAGE>

Verified video answer for a similar problem:

Key Concepts

Infrared Spectroscopy

Functional Groups

Peak Interpretation

Four infrared spectra are shown, corresponding to four of the following compounds. For each spectrum, determine the structure and explain how the peaks in the spectrum correspond to the structure you have chosen.

<IMAGE>