Which structure is consistent with both of these IR and 'H NMR data? IR, cm (intensity) H NMR, ppm (splitting, H): 2965 (strong), 1745 (strong), 1238 (strong) 0.94 (doublet, 6H), 193 (multiplet, 1H), 2.05 (singlet, 3H), 3.85 (doublet, 2H) lay. la

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**IR and NMR Data Interpretation - Which structure matches the spectral data?**

---

**Question:**
Which structure is consistent with both of these IR and ^1H NMR data?

**Data:**
- **IR (cm⁻¹, intensity):**
  - 2965 (strong)
  - 1745 (strong)
  - 1238 (strong)
  
- **^1H NMR, ppm (splitting, #H):**
  - 0.94 (doublet, 6H)
  - 1.93 (multiplet, 1H)
  - 2.05 (singlet, 3H)
  - 3.85 (doublet, 2H)

**Options:**

1. ![Structure 1](https://example.com)  
   (Sample structure showing a potential match for given spectra)
   
2. ![Structure 2](https://example.com)  
   (Sample structure showing a potential match for given spectra)
   
3. ![Structure 3](https://example.com)  
   (Sample structure showing a potential match for given spectra)
   
4. ![Structure 4](https://example.com)  
   (Sample structure showing a potential match for given spectra)
   
**Analysis:**

Using Infrared (IR) Spectroscopy and Nuclear Magnetic Resonance (NMR), we can determine the structure of an unknown compound based on provided spectral data:

- **Infrared Spectroscopy (IR):**
  - **2965 cm⁻¹:** This peak typically indicates the presence of C-H stretching in alkanes.
  - **1745 cm⁻¹:** This is indicative of a carbonyl group (C=O), common in aldehydes, ketones, and esters.
  - **1238 cm⁻¹:** This often corresponds to C-O stretching vibrations, found in esters or ethers.

- **Proton Nuclear Magnetic Resonance (^1H NMR):**
  - **0.94 ppm (doublet, 6H):** This splitting pattern suggests the presence of two equivalent CH₃ groups adjacent to a CH group.
  - **1.93 ppm (multiplet, 1H):** A complex splitting pattern indicating the presence of a methine (CH) group coupled to multiple neighbors.
  - **2.05 ppm (singlet, 3H):** A
Transcribed Image Text:**IR and NMR Data Interpretation - Which structure matches the spectral data?** --- **Question:** Which structure is consistent with both of these IR and ^1H NMR data? **Data:** - **IR (cm⁻¹, intensity):** - 2965 (strong) - 1745 (strong) - 1238 (strong) - **^1H NMR, ppm (splitting, #H):** - 0.94 (doublet, 6H) - 1.93 (multiplet, 1H) - 2.05 (singlet, 3H) - 3.85 (doublet, 2H) **Options:** 1. ![Structure 1](https://example.com) (Sample structure showing a potential match for given spectra) 2. ![Structure 2](https://example.com) (Sample structure showing a potential match for given spectra) 3. ![Structure 3](https://example.com) (Sample structure showing a potential match for given spectra) 4. ![Structure 4](https://example.com) (Sample structure showing a potential match for given spectra) **Analysis:** Using Infrared (IR) Spectroscopy and Nuclear Magnetic Resonance (NMR), we can determine the structure of an unknown compound based on provided spectral data: - **Infrared Spectroscopy (IR):** - **2965 cm⁻¹:** This peak typically indicates the presence of C-H stretching in alkanes. - **1745 cm⁻¹:** This is indicative of a carbonyl group (C=O), common in aldehydes, ketones, and esters. - **1238 cm⁻¹:** This often corresponds to C-O stretching vibrations, found in esters or ethers. - **Proton Nuclear Magnetic Resonance (^1H NMR):** - **0.94 ppm (doublet, 6H):** This splitting pattern suggests the presence of two equivalent CH₃ groups adjacent to a CH group. - **1.93 ppm (multiplet, 1H):** A complex splitting pattern indicating the presence of a methine (CH) group coupled to multiple neighbors. - **2.05 ppm (singlet, 3H):** A
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