Propanoic Acid 

 The Mass Spectrum for propanoic acid

The IR Spectrum for propanoic acid

Propanoic acid can be fragmented to give: 

  • m/z = 74
  • m/z = 29
  • m/z = 45
  • m/z = 57
  • m/z = 17
These m/z ratios all appear on this mass spectrum. This is the only spectrum in which m/z = 74 occurs.

 The IR Spectrum for propanoic acid

This IR spectra has all the peaks associated with carboxylic acids which is what propanoic acid is. It has a C   O peak at wavenumber 1000 to 1300. There is a  peak at 1640 to 1750 wavenumber indicating a C=O bond. There is a very broad peak at wavenumber 2500 to 3300 indicating a O   H bond.

 Propan-1-ol

 The Mass Spectrum for propan-1-ol

 Propan-1-ol can be fragmented to give:

  • m/z = 60
  • m/z = 29
  • m/z = 31
  • m/z = 43
  • m/z = 17
All of these m/z ratios occur on this mass spectrum. It is also the only spectrum on which the m/z of 60 occurs.

The IR Spectrum for propan-1-ol 

 This IR spectra has all the peaks associated with alcohols which is what propan-1-ol is. It has a C   O peak at wavenumber 1000 to 1300. There is a broad peak at wavenumber 3200 to 3550 indicating a O   H bond.

Propanone 

 The Mass Spectrum for propanone

 Propanone can be fragmented to give: 

  • m/z = 58
  • m/z = 43
  • m/z = 15
These m/z ratios all appear on this mass spectrum. This is the only spectrum in which m/z = 15 and m/z = 58 occurs.

 The IR Spectrum for propanone

 This IR spectra has the peak associated with ketones such as propanone. It has a C=O peak at wavenumber 1640 to 1750. 

Propanal 

  The Mass Spectrum for propanal

 Propanal can be fragmented to give: 

  • m/z = 58
  • m/z = 29
  • m/z = 29
  • m/z = 43
  • m/z = 15
These m/z ratios all appear on this mass spectrum. The m/z of 29 appears twice so there is a higher intesity.

 The IR Spectrum for propanal

  This IR spectra has the peak associated with aldehydess such as propanal. It has a C=O peak at wavenumber 1640 to 1750.

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