### Nuclear Magnetic Resonance (NMR) Spectroscopy: Structure Determination**Objective:**Determine the structure of the compounds below from their spectroscopy data. Sketch the 'H-NMR spectra of the following compounds (a and b) and assign peaks to the structures.### Compound Data:#### a) \( \mathbf{C_8H_{10}} \)- **1.2 δ** (3H, triplet)- **2.6 δ** (2H, quartet)- **7.1 δ** (5H, broad singlet)#### b) \( \mathbf{C_4H_7BrO} \)- **2.11 δ** (3H, singlet)- **3.52 δ** (2H, triplet)- **4.40 δ** (2H, triplet)### Guidelines:1. **Identify the Type of Protons:** - Triplet (t), Quartet (q), Singlet (s), and Broad Singlet (bs).2. **Corresponding Chemical Shifts (δ):** - Assign the chemical shifts to their respective hydrogen environments.3. **Sketch the 'H-NMR Spectra:** - Plot the 'H-NMR spectra for each compound using the provided data.4. **Assign Peaks to the Structures:** - Match each chemical shift to its corresponding molecular environment in the chemical structure.### Example Analysis for Compound a) \( \mathbf{C_8H_{10}} \):1. **Chemical Shift Analysis:** - 1.2 δ (3H, triplet): Likely indicates a methyl group (CH3) adjacent to a CH2 group. - 2.6 δ (2H, quartet): Likely indicates a CH2 group adjacent to a methyl group and potentially aromatic ring. - 7.1 δ (5H, broad singlet): Suggests aromatic protons.2. **Structure Sketch:** - Indicate the positions of the CH3, CH2, and aromatic protons.### Example Analysis for Compound b) \( \mathbf{C_4H_7BrO} \):1. **Chemical Shift Analysis:** - 2.11 δ (3H, singlet): Indicates a methyl group (CH3) not adjacent to any other hydrogens. - 3.52 δ (2

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7. Determine the structure of the compounds below from their spectroscopy data. Sketch the 'H-NMR spectra of the following a and b compounds. Assign peaks to the structures. a) C3H10 1.2 8 (3H, triplet) 2.6 8 (2H, quartet) 7.1 8 (5H, broad singlet) b) C4H7BrO 2.11 8 (3H, singlet) 3.52 8 (2H, triplet) 4.40 8 (2H, triplet) mScanner

7. Determine the structure of the compounds below from their spectroscopy data. Sketch the 'H-NMR spectra of the following a and b compounds. Assign peaks to the structures. a) C3H10 1.2 8 (3H, triplet) 2.6 8 (2H, quartet) 7.1 8 (5H, broad singlet) b) C4H7BrO 2.11 8 (3H, singlet) 3.52 8 (2H, triplet) 4.40 8 (2H, triplet) mScanner

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

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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IR Spectroscopy

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).

Question

### Nuclear Magnetic Resonance (NMR) Spectroscopy: Structure Determination

**Objective:**
Determine the structure of the compounds below from their spectroscopy data. Sketch the 'H-NMR spectra of the following compounds (a and b) and assign peaks to the structures.

### Compound Data:

#### a) \( \mathbf{C_8H_{10}} \)
- **1.2 δ** (3H, triplet)
- **2.6 δ** (2H, quartet)
- **7.1 δ** (5H, broad singlet)

#### b) \( \mathbf{C_4H_7BrO} \)
- **2.11 δ** (3H, singlet)
- **3.52 δ** (2H, triplet)
- **4.40 δ** (2H, triplet)

### Guidelines:

1. **Identify the Type of Protons:**
- Triplet (t), Quartet (q), Singlet (s), and Broad Singlet (bs).

2. **Corresponding Chemical Shifts (δ):**
- Assign the chemical shifts to their respective hydrogen environments.

3. **Sketch the 'H-NMR Spectra:**
- Plot the 'H-NMR spectra for each compound using the provided data.

4. **Assign Peaks to the Structures:**
- Match each chemical shift to its corresponding molecular environment in the chemical structure.

### Example Analysis for Compound a) \( \mathbf{C_8H_{10}} \):

1. **Chemical Shift Analysis:**
- 1.2 δ (3H, triplet): Likely indicates a methyl group (CH3) adjacent to a CH2 group.
- 2.6 δ (2H, quartet): Likely indicates a CH2 group adjacent to a methyl group and potentially aromatic ring.
- 7.1 δ (5H, broad singlet): Suggests aromatic protons.

2. **Structure Sketch:**
- Indicate the positions of the CH3, CH2, and aromatic protons.

### Example Analysis for Compound b) \( \mathbf{C_4H_7BrO} \):

1. **Chemical Shift Analysis:**
- 2.11 δ (3H, singlet): Indicates a methyl group (CH3) not adjacent to any other hydrogens.
- 3.52 δ (2

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