View Benzene Ir Spectrum Functional Groups Background. A look at the spectrum of any pure molecule will disclose that many functional groups have multiple peaks. Functional groups are the portions in an.

Infrared spectra are generally informative about what functional groups are present, but not always.

For example, you could have a methyl group on your benzene ring and not be able to. This is because each functional group contains certain bonds, and these bonds always show up in the same places in the ir spectrum. Ir spectrum of an internal alkyne vs a ir spectrum of aromatic benzene ring derivatives c=c & =ch stretch. Ir is mainly used to determine what functional groups are present, not necessarily the structure.