4. You analyze a mixture of cyclopentane, pyrrolidine, and tetrahydrofuran by gas chromatography and obtain the following GC trace. N O cyclopentane pyrrolidine tetrahydrofuran area A= 100 intensity area B = 70 area C= 180 retention time (min) a) Label the peaks on the GC trace with the compounds they correspond to. Explain how you made your assignments. (Hint: look up the boiling points of the compounds.)

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**Gas Chromatography Analysis of Cyclopentane, Pyrrolidine, and Tetrahydrofuran**

In this exercise, the analysis involves a mixture of cyclopentane, pyrrolidine, and tetrahydrofuran, examined using gas chromatography (GC). Below is the GC trace obtained from the analysis, alongside an explanation of the data.

**Chemical Structures:**

- **Cyclopentane:** A five-membered carbon ring.
- **Pyrrolidine:** A five-membered ring with one nitrogen atom.
- **Tetrahydrofuran:** A five-membered ring with one oxygen atom.

**GC Trace Explanation:**

The GC trace graph plots *intensity* versus *retention time (min)*, highlighting three distinct peaks labeled A, B, and C. Each peak represents one of the compounds in the mixture. The areas under the peaks are given as:
- Area A = 100
- Area B = 70
- Area C = 180

**Retention Time and Peak Identification:**

- **Cyclopentane:** The first peak (A) due to its lower boiling point, eluting fastest.
- **Pyrrolidine:** Corresponds to the second peak (B).
- **Tetrahydrofuran:** The third peak (C), with the largest area.

**Task: Labeling Peaks**
- Label the GC trace peaks (A, B, C) with the corresponding compound names. Use the boiling points of the compounds to support your identification of peaks.

**Conclusion:**
The peaks are identified based on the order of elution, informed by their boiling points:
1. **Cyclopentane** (Peak A)
2. **Pyrrolidine** (Peak B)
3. **Tetrahydrofuran** (Peak C)

This exercise demonstrates the utility of boiling point in predicting the order of compound elution in gas chromatography, allowing for effective peak identification.
Transcribed Image Text:**Gas Chromatography Analysis of Cyclopentane, Pyrrolidine, and Tetrahydrofuran** In this exercise, the analysis involves a mixture of cyclopentane, pyrrolidine, and tetrahydrofuran, examined using gas chromatography (GC). Below is the GC trace obtained from the analysis, alongside an explanation of the data. **Chemical Structures:** - **Cyclopentane:** A five-membered carbon ring. - **Pyrrolidine:** A five-membered ring with one nitrogen atom. - **Tetrahydrofuran:** A five-membered ring with one oxygen atom. **GC Trace Explanation:** The GC trace graph plots *intensity* versus *retention time (min)*, highlighting three distinct peaks labeled A, B, and C. Each peak represents one of the compounds in the mixture. The areas under the peaks are given as: - Area A = 100 - Area B = 70 - Area C = 180 **Retention Time and Peak Identification:** - **Cyclopentane:** The first peak (A) due to its lower boiling point, eluting fastest. - **Pyrrolidine:** Corresponds to the second peak (B). - **Tetrahydrofuran:** The third peak (C), with the largest area. **Task: Labeling Peaks** - Label the GC trace peaks (A, B, C) with the corresponding compound names. Use the boiling points of the compounds to support your identification of peaks. **Conclusion:** The peaks are identified based on the order of elution, informed by their boiling points: 1. **Cyclopentane** (Peak A) 2. **Pyrrolidine** (Peak B) 3. **Tetrahydrofuran** (Peak C) This exercise demonstrates the utility of boiling point in predicting the order of compound elution in gas chromatography, allowing for effective peak identification.
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