Four IR spectra, A D, are shown below. The compounds concemed are (in random order) 2-butanol (a secondary alcohol), heptanal (an aldehyde). 3-pentanone (a ketone) and acetic acid (ethanoic acid, a carboxylic acid). Use the crude correlation table and chart on the previous page to determine which spectrum belongs to which compound. and assign as many absorption bands as you can 4. Ad Co eth sub A Sele Ac Co Se D