7/18/2016 11:55 PM A 87/100 7/18/2016 06:12 PM Gradebook Print Calculator I Peri

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7/18/2016 11:55 PM A 87/100 7/18/2016 06:12 PM Gradebook Print Calculator I Periodic Table Question 25 of 25 Sapling Learning macmillan learning IR spectroscopy can often be used to eliminate possible compounds because of the lack of IR absorptions expected for key functional groups Given the following IR ata, which functional group(s) can be eliminated? 1. A very strong stretch is observed at 1700 cm ester 2. Only a weak stretch is observed above 3000 cm 1, at 3073 cm 1 aldehyde carboxylic acid primary amide ketone The remaining compounds can be diffentiated by the following data: Two stretches are observed at 2827 and 2745 cm 1. dentify the compound ketone primary amide ester aldehyde O carboxylic acid Previous X Give Up & View Solution Check Answer Next ECI Exit Hint

Explanation / Answer

Solution:- (1) A very strong stretch at 1700 cm-1 (C=O) and a weak stretch at 3073 cm-1 (N-H) is a strong indication of an amide. So, ester, eldehyde, carboxylic acid and ketone all could be eliminated.

(2) Aldehydes gives two stretches at 2827 cm-1 and 2745 cm-1 for =C-H. None of the other group gives this so the compound is an aldehyde.

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