spectroscopy

Concentrated alcohols give rise to broad signals while dilute alcohols give rise to narrow signals

Carboxylic acids exist as dimer due to hydrogen bonding and thus produce a narrow signal at 3600 cm^-1 and a characteristic signal due to C=O at 1700 cm^-1

C=O bonds produce strong signals in an IR spectrum while C=C bonds often produce a weak signals

Symmetrical C=C bonds and C≡C bonds do not produce signals

Primary amines produce two signals resulting from symmetric stretching and asymmetric stretching