The image below shows a portion of a 'H NMR spectrum (ppm). Choose the partial structure that best fits this data. 3.0 A) CH3-CH,-CH2-O- B) CH3-CH,-CH, C=O C) CH3-CH2-CH-O D) (CH3)2-CH- E) (CH3)2-CH-O
Analyzing Infrared Spectra
The electromagnetic radiation or frequency is classified into radio-waves, micro-waves, infrared, visible, ultraviolet, X-rays and gamma rays. The infrared spectra emission refers to the portion between the visible and the microwave areas of electromagnetic spectrum. This spectral area is usually divided into three parts, near infrared (14,290 – 4000 cm-1), mid infrared (4000 – 400 cm-1), and far infrared (700 – 200 cm-1), respectively. The number set is the number of the wave (cm-1).
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Infrared (IR) or vibrational spectroscopy is a method used for analyzing the particle's vibratory transformations. This is one of the very popular spectroscopic approaches employed by inorganic as well as organic laboratories because it is helpful in evaluating and distinguishing the frameworks of the molecules. The infra-red spectroscopy process or procedure is carried out using a tool called an infrared spectrometer to obtain an infrared spectral (or spectrophotometer).
See image below
![**Transcription and Analysis of \( ^1H \) NMR Spectrum**
*The image below shows a portion of a \( ^1H \) NMR spectrum (ppm).*
Choose the partial structure that best fits this data.
**Graph Description:**
- The x-axis represents the chemical shift in parts per million (ppm).
- There are three distinct sets of peaks displayed in the spectrum.
1. **Peak at ~3.6 ppm**:
- This multiplet suggests a CH group possibly adjacent to electronegative atoms or groups.
2. **Peak at ~2.1 ppm**:
- This smaller set of peaks suggests a more saturated environment, possibly a CH2 group adjacent to the CH from the previous peak.
3. **Peak at ~1.0 ppm**:
- This large set of peaks is indicative of a terminal CH3 group, representing a typical chemical shift for such protons.
**Structure Options:**
- A) \( \text{CH}_3\text{-CH}_2\text{-CH}_2\text{-O-} \)
- B) \( \text{CH}_3\text{-CH}_2\text{-CH}_2\text{-C=O} \)
- C) \( \text{CH}_3\text{-CH}_2\text{-CH-O} \)
- D) \( (\text{CH}_3)_2\text{-CH-} \)
- E) \( (\text{CH}_3)_2\text{-CH-O} \)
As each structure is analyzed, observe how the data aligns with the peaks in the NMR spectrum. This information will help determine which partial structure fits the observed data best.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F97a0b142-fcf0-4b7b-946c-b5d706c6bb8f%2Fce384dd1-fb0d-48c0-9513-385b007d1c96%2Fs0yx3jf_processed.jpeg&w=3840&q=75)
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