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. The bands are broadened due to hydrogen bonding and a sharp 'non-bonded' peak can often be seen at around 3400 cm.
. The bands are of medium intensity and are often obscured by other absorbances in the region (i.e., OH).
. Absorptions from nitriles are generally of medium intensity and are clearly defined. Alkynes absorb weakly in this region unless they are highly asymmetric; symmetrical alkynes do not show absorption bands.
. The bands are generally very strong and broad. Carbonyl compounds which are more reactive in nucleophilic addition reactions (acyl halides, esters) are generally at higher wave number than simple ketones and aldehydes, and amides are the lowest, absorbing in the region 1700-1650 cm.
. The bands are generally sharp and of medium intensity. Aromatic compounds will typically display a series of sharp bands in this region.
. The bands are generally strong and broad. You should note that many other functional groups have bands in this region which appear similar.