Spectroscopic Properties of Aldehydes and Ketones

• IR

  • aldehyde C-H at 2700-2900cm-1
  • C=O signal at 1665-1780 cm-1

• Proton NMR

  • C-H of aldehyde at 9 ppm singlet

• UV

  • Carbonyl Chromaphore at 270-300 nm
  • increases with conjugation

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