On the following pages are three sets of three IR spectra. For the problem set,

Question

On the following pages are three sets of three IR spectra. For the problem set, each group of three spectra has to be matched with the three structures. Rely on your knowledge of specific absorptions for specific functional groups to identify these compounds correctly. (See table in Techniques manual.) Indicate the important peaks in each spectrum, and show your work 2. in Technige aual) Indicate the important peaks in each spectrum, and show your work and logic. Set 1 0 Set 2 polystyrene polyethylene poycarbonate CH3 CH3(CH2)7-C-OH

Explanation / Answer

1) In IR spectra around 1750cm-1 peak indicates it is belongs to amide stretch

therfore compound is "B" i.e amide

2)  In IR spectra around 1750cm-1 peak indicates it has carbonyl group

therfore in the given compounds "C" has carbony function. structure C is opt to that specta

3) In IR spectra around 3500cm-1 broad peak indicates it has -COOH group

therfore in the given compounds "C" has Acid function. structure C is opt to that specta

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