Primary aliphatic amines

What is main different between primary amine and secondary amine in IR spectrum?

Primary amines consist of two small peaks, and the overall effect is to make the absorptions of a primary amine look like a cow udder, as shown in the second figure). Secondary amines (amines substituted by two R groups and abbreviated R2NH) consist of only a single absorption in that region.

Do amines show in NMR?

The proton nmr spectra of amines show characteristic absorptions for H−C−N protons around 2.7ppm. The positions of the resonances of N−H protons show considerable variability as the result of differences in degree of hydrogen bonding (Section 9-10E).