The question reads:
Identify the IR characteristic signals that you would expect in each of the following compounds. For every signal provide the approximate wavenumber. See attatched for compounds.
It's useful to identify the major functional groups first, then you can tackle the wave numbers characteristic to them
1) Carboxylic acid, alkane
2) Ketone, alkane, primary ...
The expert identifies the IR characteristic signals that you would expect in each of the following compounds.