This unknown will contain an aldehyde functional group but may also contain other functional groups as well. The tools you will have available to...
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Can someone help me fill out the charts and show me the structure?

 This is my first year in Chemistry and I can't figure this out.

I filled out most of it but I'm not sure if I did it right such as the TLC and the Results for Functional Group Tests Chart.

If someone can, could also explain the concepts the lab is asking for to help me better understand this lab?


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7-3: Qualitative Analysis - Aldehydes In this assignment, you will be given an unknown compound for which you will need to determine its chemical structure. This unknown will contain an aldehyde functional group but may also contain other functional groups as well. The tools you will have available to perform this analysis include 15 functional group tests, FTIR and NMR spectroscopy, plus other useful data. 1. Start Virtual ChemLab and select Qualitative Analysis -Aldehydes from the list of assignments in the electronic workbook. You should be brought to the Qualitative Analysis laboratory, and on the reagent shelf you will find two or more compounds that serve as practice unknowns and another bottle that is your assigned unknown. The practice unknowns can be used to gain proficiency with the functional group tests and FTIR and NMR spectra interpretation. When you are ready to analyze your unknown, click on the unknown bottle and add the syringe or scoop to the round bottom flask. Now drag the flask from the stockroom counter to the cork ring on the lab bench. 2. The round bottom flask containing the unknown should now be on the cork ring on the lab bench. The boiling point and C-H analysis for the unknown are listed on the chalkboard. If the unknown is a solid, the melting point can be measured by clicking on the melting point apparatus to the left of the lab bench and dragging the melting point tube to the unknown in the flask. The melting point will be displayed on the red LED, which can be enlarged by mousing over the apparatus. It will also be useful to know the polarity of the unknown by performing a TLC measurement. Record all of this information in the data table below. Data Table C-H Analysis Melting Point ("C) Boiling Point (*C) TLC (R) C= 55.63 %H= 3.33 108 -C 300 *C -0.2 3. To collect an FTIR spectrum of your unknown, click on the FTIR spectrometer located to the left of the lab bench and drag the salt plate icon to the flask on the lab bench. A window containing the FTIR spectrum for your product should now open. Identify the relevant peaks in the FTIR spectrum and record the position and associated functional group for each in the FTIR table below. The FTIR spectrum can also be saved to the lab book for later analysis. FTIR List position (cm") & functional group 4. -2900 cm-1, Presence of Alkane 5. -1750 cm-1, Compound is Aldehyde 6. 7. 4. To collect a 'H NMR spectrum of your unknown, click on the NMR magnet located to the right of the lab bench and drag the NMR sample tube to the flask on the lab bench. A window containing the NMR spectrum for your unknown should now open. You can zoom into various portions of the NMR spectrum by clicking and dragging over the desired area. The Zoom Our button is used to zoom back out to view the full spectrum. Identify all of the peaks in the NMR spectrum and record the chemical shift, the splitting, and the number of hydrogens for each peak in the NMR table on the reverse side. The NMR spectrum can also be saved to the lab book for later analysis. "C NMR and Mass Spectrometry are also available in the laboratory to help you determine the structure of your unknown.

'H NMR Peak Chemical Multiplicity Chemical Shift (8) Peak Shift (8) Multiplicity Ht 8.42 doublet 7 8.22 doublet 10 S 11 12 Specify the multiplicity as a singlet ($), doublet (d), triplet (t), quartet (q), or multiplet (m). *Specify the number of hydrogens associated with each peak. 5. To perform the functional group tests, click on the unknown and drag a test tube containing the unknown to the clamp over the stir plate. You should see a picture of your unknown on the chalkboard. Now perform the bromine test by clicking on the reagent bottle labeled Bra and drag the pipet to the test tube. The results of the test are shown on the chalkboard with either a picture or a short video clip. Record the results of the test as either positive or negative in the table below. (See your textbook for a description of the functional group tests.) Discard the test tube by dragging it to the red disposal bucket and repeat the procedure for the other functional group tests. Make sure to record all of your results in the table below. Results for Functional Group Tests Functional Group Test +/- Functional Group Test +/- Bromine Test lodoform Test Permanganate Test + Sodium Hydroxide + Jones Oxidation Test + Hydroxamate Test Lucas Test Hinsberg Test Periodic Acid Hydrochloric Acid + Tollens Test + Sodium Iodide/Acetone 2,4-Dinitrophenylhydrazine + Sodium Iodide/Acetone + Heat Sodium Bisulfite Addition + 6. Using the data you have now collected, determine the structure of your unknown compound and report the name and structure below. Be sure to include your unknown number, which is shown on the chalkboard Unknown # #205 Name: 4-hydroxybenzaldehyde Structure:

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