The principal peaks in an IR spectra for benzoic acid are:

* O-H stretch: 3035 cm-1

* C=O stretch: 1685 cm-1

* C-C stretch: 1595 cm-1

* C-H bend: 1450 cm-1

* C-O stretch: 1275 cm-1

* C-C stretch: 1180 cm-1

* C-H bend: 755 cm-1

* Out of place O-H bend: 935 cm-1