Question:Spectra are given for three compounds. Each compound has one or more of the following functional groups: alcohol, amine, ketone, aldehyde, and carboxylic acid. Determine the functional group(s) in each compound, and assign the major peaks above 1600cm^-1.

IR spectroscopy helps detect the functional groups present in the given organic compound. Observe closely the peaks that are obtained in the IR spectrum. Each functional group has a characteristic absorption in IR spectroscopy.

If the given spectrum is observed, the peaks are observed at represents the $1660 c{m}^{-1}$ stretch.

A medium peak at$3360 c{m}^{-1}-3200 c{m}^{-1}$ indicates the N-H stretch.

The peaks betweenrole="math" localid="1660720065115" $3000 c{m}^{-1}-2840 c{m}^{-1}$ indicates the presence of C-H stretch.

Hence, the peaks role="math" localid="1660720014870" $1600 c{m}^{-1}$above are N-H stretch, C-H stretch, and C=O stretch.

If the given spectrum is observed, a broad peak is observed between $3300 c{m}^{-1}-2500 c{m}^{-1}$, representing the O-H stretch. The peaks between $3000 c{m}^{-1}-2840 c{m}^{-1}$indicates the presence of C-H stretch.

The peak at $31711c{m}^{-1}$indicates the in carboxylic acid.

Thus, the peaks above$1600c{m}^{-1}$ are O-H stretch, C-H stretch, and C=O stretch.

If the given spectrum is observed, a broad peak is observed between$3500 c{m}^{-1}-3300 c{m}^{-1}$ , representing the O-H stretch. The peaks between$3000 c{m}^{-1}-2840 c{m}^{-1}$ indicates the presence of C-H stretch.

Thus, the peaks above are O-H stretch, and C-H stretch.