IR PROBLEMS 1. The following compounds produced the IR spectra shown. Analyze the spectrum and assign as many peaks as possible in the spectrum. CH3 90 80- 70- 60- 50. 40 30 - 20 - 10+ 1000 500 3000 2500 2000 1500 4000 3500 Wavenumbers (cm-1) % Transmittance
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Solution:
Q.1.
The name of the given compound is acetophenone. The main IR absorption peaks for this compound are shown below ---
i) The carbonyl (C=O) stretching absorption band appeared at around 1730 cm-1.
ii) The aromatic CH or sp2-CH stretching absorption band appeared at around 3040-3010 cm-1.
iii) The sp3-CH stretching frequency peak appeared at around 2950-2910 cm-1.
iv) The sp2 carbon-carbon double bond stretching frequency peak appeared at around 1650 cm-1.
Q.2.
The name of the given second compound is benzoic acid. The main IR absorption peaks for this compound are shown below ---
i) The carbonyl (C=O) of carboxylic acid group stretching absorption band appeared at around 1700 cm-1.
ii) The aromatic CH or sp2-CH stretching absorption band appeared at around 3000-2940 cm-1.
iii) The sp2 carbon-carbon double bond stretching frequency peak appeared at around 1600 cm-1.
Q.3.
The name of the given third compound is propanamide. The main IR absorption peaks for this compound are shown below ---
i) The carbonyl (C=O) of amide compound stretching absorption band appeared at around 1610-1590 cm-1.
ii) The sp3-CH stretching absorption band appeared at around 3000-2900 cm-1.
iii) The N-H stretching frequency peak appeared at around 3400 cm-1.
iv) The sp3 carbon-carbon double bond stretching frequency peak appeared at around 1210 cm-1.
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