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IR Spectroscopy   Please answer in detail   Use the following Correlation Table to help with answering the questions below

Chemistry Nov 02, 2020

IR Spectroscopy

 

Please answer in detail

 

Use the following Correlation Table to help with answering the questions below.

 

 

Q1. Calculate the degrees of unsaturation for each molecule given below. Show your work

 

 

 

 

Q2. From the list of compounds on the chalkboard, select Alcohols. Locate the jar of benzyl alcohol. Click on the jar to fill the syringe with your compound and transfer it to the round bottom flask by dragging the syringe to the round bottom flask and hovering overtop. Drag the round bottom flask to the cork ring on the bench. Locate the IR machine, click and an IR plate will appear. Drag the IR plate to the round bottom flask and hover over the round bottom flask. Release the mouse button and a spectra will appear. Analyze that spectra by filling out the table below.

 

 

Wavenumber (cm-1)

Shape and Intensity

Functional Group

 

 

 

 

 

 

 

 

 

 

 

 

Q3. From the list of compounds on the chalkboard, select Acids. Locate the jar of heptanoic acid. Click on the jar to fill the syringe with your compound and transfer it to the round bottom flask by dragging the syringe to the round bottom flask and hovering overtop.  Drag the round bottom flask to the cork ring on the bench. Locate the IR machine, click and an IR plate will appear. Drag the IR plate to the round bottom flask and hover over the round bottom flask. Release the mouse button and a spectra will appear. Analyze that spectra by filling out the table below.

 

Wavenumber (cm-1)

Shape and Intensity

Functional Group

 

 

 

 

 

 

 

 

 

 

Q4. Compare the OH bands of the two molecules above. What are the differences between them? Why do these differences occur?

 

Q5. Obtain the spectra of benzylamine, diisopropylamine and triethyl amine. Fill out an IR analysis table for each of these compounds.

 

 

Benzylamine

Wavenumber (cm-1)

Shape and Intensity

Functional Group

 

 

 

 

 

 

 

 

 

 

Diisopropylamine

Wavenumber (cm-1)

Shape and Intensity

Functional Group

 

 

 

 

 

 

 

 

 

 

 Triethylamine

Wavenumber (cm-1)

Shape and Intensity

Functional Group

 

 

 

 

 

 

 

 

 

 

Q6. Compare the N-H stretch region of each spectra. What is the difference between them? Why is there this difference?

 

Q7. Obtain the spectra of cyclohexanone(ketone), 3-Methylbutyl Acetate(Ester) and N,N- diisopropyl-acetamide (amide). Fill out an IR analysis table for each of these compounds.

 

Cyclohexanone

Wavenumber (cm-1)

Shape and Intensity

Functional Group

 

 

 

 

 

 

 

 

 

 

3-Methylbutyl Acetate

 

Wavenumber (cm-1)

Shape and Intensity

Functional Group

 

 

 

 

 

 

 

 

 

 

N, N, Diisopropyl-acetamide

 

Wavenumber (cm-1)

Shape and Intensity

Functional Group

 

 

 

 

 

 

 

 

 

 

 

Q8. Compare the wavenumber that the carbonyl stretch appears at for each molecule. Explain why the ester carbonyl vibrates at a higher wavenumber than that of the ketone and why the ketone carbonyl vibrates at a higher wavenumber than that of the amide.

 

Q9. Compare the following molecules, describe whether or not you would be able to distinguish these compounds from one another based on their IR

 

 

 

 

 

 

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