C₇H₆O

From the molecular formula, the compound has "5 degrees of unsaturation" (five double bonds, carbonyls or rings). The large number suggests the possible presence of an aromatic ring (4 degrees of unsaturation).

3400 cm-1:	no OH or NH peak present		3100 cm-1:	moderate peak suggesting sp2 CH
2900 cm-1:	no peak indicating sp3 CH		2700 cm-1:	moderate peak suggesting aldehyde CH
2200 cm-1:	no unsymmetrical triple bonds		1700 cm-1:	strong carbonyl absorbance
1600 cm-1:	bands consistent with Ar C=C

The spectrum seems to be consistent with an aldehyde containing no saturated carbon. The large number of degrees of unsaturation suggest the presence of an aromatic ring.

*
Structure:

IUPAC Name: benzaldehyde