�Structural
unit
Frequency, cm-1
�Bending vibrations of derivatives of benzene
�Monosubstituted
730-770
and 690-710
�Ortho-disubstituted
735-770
�Meta-disubstituted
750-810 and 680-730
�Para-disubstituted
790-840
Table 13.4 (p 519)
Infrared Absorption Frequencies