Question

Which of the following functional group(s) does not show two absorption peaks in IR spectroscopy:

• A. Anhydride
• B. Primary amine
• C. Nitro
• D. Secondary amine

Hint:

Secondary amines show a single N–H stretch, unlike primary amines or nitro groups.

Answer 1

The Correct Option is D

Functional groups like anhydrides, nitro compounds, and primary amines typically show two absorption bands due to symmetric and asymmetric stretching vibrations. Secondary amines, on the other hand, usually show only one N–H stretching peak in the IR spectrum.