For the following InfraRed spectra, identify the existing functional groups. Functional group A is present because of the peak at 3329 cm-1: A is ________________________________________ Functional group B is present because of the peak at 3076 cm-1: B is

The HNMR spectra shown below contains six singlets that correspond to the six different proton groups identified in structure 1. Use an HNMR table to help match each signal to a proton group.

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1. What do you suppose is the molecular weight of the molecule that gives the mass spectrum below? 27 Hai 55 26 45 30 40 50 Rel Abund 100r 80- 60- 40- 20- 0- m/z0 10 Rel Abund = Relative Abundance Formula 1: 20 Formula 2: Formula 3: m/z = mass divided by charge 3. What is the base peak? 2. Provide three different molecular formulas (organic molecules, please) that are possible for a molecule with the molecular weight you have chosen. What are the degrees of unsaturation (SODAR) for each? Degrees of unsaturation: Degrees of unsaturation: Degrees of unsaturation: 60 4. Draw a possible molecule for each formula. based on Formula 1 5. Which structure do you think is correct? 72 70 based on Formula 2 80 What mass is lost from the molecular ion to get to the base peak? 90 100 based on Formula 3

For molecule A attribute the spectral features you observe only in the double bond, triple bond and single bond regions. Then make a conclusion as to the main functional groups in the molecule in the table below. 100 Transmittance %T a. Spectra for molecule A 0 A 4000 3000 2000 wavenumber cm 1 1500 1000 Main functional groups in this molecule therefore are? 500 Wavelength (nm) What group does it relate to?

Question 8

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8 16) Chemical Formula: C.H₂O₂ IR: strong peak 1720cm-1 3H 17) Chemical Formulae: C12H18 4H, Doublet Triplet Triplet Doublet 3 5H Unknowns for 1H NMR Final Report 6 5 18) Chemical Formula: C₂H120 IR: Strong broad peak at 3200 cm-¹ 2H 5 1H 2 PPM 4 PPM 1H Quartet, 2H PPM 3 3H Singlet, 9H Triplet, 3H 2H 3H 0

Label 3 peaks and what functional groups and their wavelength they could possibly correlate with in.