Indicate which structure produces the mass spectra below. Submit your answer as a single letter with no abbreviation. 45 100 - MS-NU-1331 80 – 60 - 40 - 20 - 74 29 10 20 30 40 50 60 70 80 90 100 110 120 m/z (a) (b) (c) (d) (e)

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### Identifying the Structure Producing the Mass Spectra

#### Problem Statement:
Indicate which structure produces the mass spectra below. Submit your answer as a single letter with no abbreviation.

#### Mass Spectrum Explanation:
The mass spectrum provided displays the following key peaks (m/z is the mass-to-charge ratio):
- A peak at m/z = 29
- A large peak at m/z = 45
- A peak at m/z = 74

The y-axis represents the relative intensity of the detected ions, ranging from 0 to 100. The x-axis represents the m/z values, ranging from 10 to 120.

#### Provided Structures:
Below the mass spectrum, six chemical structures are shown with labels (a) to (f):

**Structure (a):**
```
   O
   | |
CH3-C-CH3
```

**Structure (b):**
```
   O
   | |
CH3-O-CH2-CH3
```

**Structure (c):**
```
CH3-CH2-NH2
```

**Structure (d):**
```
   H
   |
CH3-CH2-NH-CH3
```

**Structure (e):**
```
CH3-CH-O-CH2-CH3
```

#### Answer Section:

- **Answer:**

Please match the observed peaks with the given structures to determine which structure corresponds to the provided mass spectrum. 

**Answer**: ____

> Note: When you submit the answer, make sure to provide the answer as a single letter (a, b, c, d, e, or f) without any abbreviation.
Transcribed Image Text:### Identifying the Structure Producing the Mass Spectra #### Problem Statement: Indicate which structure produces the mass spectra below. Submit your answer as a single letter with no abbreviation. #### Mass Spectrum Explanation: The mass spectrum provided displays the following key peaks (m/z is the mass-to-charge ratio): - A peak at m/z = 29 - A large peak at m/z = 45 - A peak at m/z = 74 The y-axis represents the relative intensity of the detected ions, ranging from 0 to 100. The x-axis represents the m/z values, ranging from 10 to 120. #### Provided Structures: Below the mass spectrum, six chemical structures are shown with labels (a) to (f): **Structure (a):** ``` O | | CH3-C-CH3 ``` **Structure (b):** ``` O | | CH3-O-CH2-CH3 ``` **Structure (c):** ``` CH3-CH2-NH2 ``` **Structure (d):** ``` H | CH3-CH2-NH-CH3 ``` **Structure (e):** ``` CH3-CH-O-CH2-CH3 ``` #### Answer Section: - **Answer:** Please match the observed peaks with the given structures to determine which structure corresponds to the provided mass spectrum. **Answer**: ____ > Note: When you submit the answer, make sure to provide the answer as a single letter (a, b, c, d, e, or f) without any abbreviation.
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