Question

In: Chemistry

​Examine the IR below and classify the compound.

Examine the IR below and classify the compound.

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Alcohol

Aldehyde

Carboxylic acid

Ketone


Solutions

Expert Solution

Answer is carboxylic acid actually given IR spectrum is of ethanoic acid as ethanoic acid contains

  • carbon-oxygen double, C=O
  • carbon-oxygen single, C-O
  • oxygen-hydrogen, O-H
  • carbon-hydrogen, C-H
  • carbon-carbon single, C-C
  • structure:



    The carbon-oxygen single bond has an absorbtion in the fingerprint region, varying between 1000 and 1300 cm-1 depending on the molecule

  • The C-H bond (where the hydrogen is attached to a carbon which is singly-bonded to everything else) absorbs somewhere in the range from 2853 - 2962 cm-1

  • The carbon-oxygen double bond, C=O, is one of the really useful absorptions, found in the range 1680 - 1750 cm-1

  • The other really useful bond is the O-H bond. It is easily recognised in an acid because it produces a very broad trough in the range 2500 - 3300 cm-1.

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