The strong $1724\,\mathrm{cm^{-1}}$ absorption is the <carbonyl stretching vibration> of a saturated <ketone>. Its exact <wavenumber> depends on substitution and measurement conditions; the important discrimination is that it is far below the high-frequency <acyl chloride> band in B and is accompanied by a <carbonyl> <carbon-13 NMR> resonance near 200 ppm.

Solution

Past exam of the chemistry course of the year 1 of the natural sciences course of the University of Cambridge / 2022 / Paper 1 / 1 / a / ii / Solution

 Solution (source code)