Site navigation

The order of carbonyl stretching frequency in IR spectra of acetone, acetamide and acetic anhydride follows

Question and options

The order of carbonyl stretching frequency in IR spectra of acetone, acetamide and acetic anhydride follows
  1. anhydride > amide > ketone
  2. ketone > amide > anhydride
  3. amide > anhydride > ketone
  4. anhydride > ketone > amide

Answer and explanation

Correct answer: D - anhydride > ketone > amide
C=O\mathrm{C{=}O} stretch: anhydride ~1820/1760 cm−1\mathrm{cm^{-1}} (inductive effect, coupled), ketone ~1715 cm−1\mathrm{cm^{-1}}, amide ~1650-1690 cm−1\mathrm{cm^{-1}} (resonance lowers it). So anhydride > ketone > amide.

Practice for these exams

  • CUSAT CAT M.Sc. Forensic Science

  • Bihar Judicial Services

    Subject revision

  • Uttarakhand Judicial Services

    Subject revision

Related question papers

Related exam syllabi

More solved explanations in General science & technology