This is the IR spectroscopy data for benzil. Which peaks are important/unique, w

Question

This is the IR spectroscopy data for benzil. Which peaks are important/unique, what're their wavenumbers, and what is the assignment for each one?
Explaining how you were able to determine it would also be a big help.
Thanks in advance, I appreciate it! 1o s Feb 08 08 02 44 2018 (GMT-05.00 50 20 10 4000 3500 3000 1500 1000 2500 2000 Wavenumbers (cm-1) Thu Feb 08 08:04:09 2018 (GMT-05:00) FIND PEAKS Thu Feb 08 08:02:44 2018 (GMT-05:00) 4000.12 611.86 Region: Absolute threshold: 72.070 Sensitivity: 50 Peak list Position: 642.54 Intensity: 31.772 Position: 681.25 Intensity: 53.106 Position: 696.01 Intensity: 50.973 Position: 718.24 Intensity: 32.571 Position: 876.02 Intensity: 41.354 Position: 1162.84 Intensity: 60.237 Position: 1174.31 Intensity: 44.904 Position: 1210.97 Intensity: 26.613

Explanation / Answer

IR spectrum interpretation of benzil

Benzil structure has two phenyl rings attacked at the end of two carbonyls joined together,

C6H5-CO-CO-C6H5

the spectrum shows the following major identifiable peaks

3063 cm-1 peak for sp2 =C-H stretch

1677 and 1659 cm-1 peak for C=O stretch

1578, 1593 cm-1 peaks for C=C stretch

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