[vande060]

If you take an IR of benzaldehyde will you get a peak for c=c and the aromatic ring separately, or is it just one peak, because the double bonds are inherent to the aromatic ring?

Thanks

[kizzler85]

C=C ring stretch will still show up sharply and will be right next to the carbonyl frequency. There will also be the broad C-H stretching involved with any arene. I