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how do you find a chemical shift of an unknown arene?

I am trying to find the absorptions and chemical shift of an unknown arene?

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Wyatt G. | Don't let your O-chem homework give you the Sunday SadsDon't let your O-chem homework give you ...
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You would need the structure to estimate a chemical shift, or vice versa.  An aryl hydrogen would show a C-H peak in an IR spectrum just after 3030 cm-1 and C=C peak around 1500-1600.  HNMR and CNMR chemical shifts can vary a good deal depending on the structure.
Regina G. | Biotech Grad with Homeschool Experience, Math and Science FocusBiotech Grad with Homeschool Experience,...
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Are you doing IR spect? 
 
In spect, you need to check the absorption charts and look to see if there are absorptions in the fingerprint region.