Question

What is the fingerprint region of an IR spectrum?

A.The region above 1500 cm-1 that contains all of the distinguishable functional groups.

B.The region of the IR that will allow us to positively identify a molecule because it is characteristic to that molecule

C.The region below 1500 cm-1 that contains the majority of stretching and bending signals.

D.Both A and B.

E.Both B and C.

Answer 1

The correct option is B

B.The region of the IR that will allow us to positively identify a molecule because it is characteristic to that molecule

In the IR spectroscopy, the fingerprint region is the unique region wherein the signals of the particular compound are specific to only that particular compound.

C.The region below 1500 cm-1 that contains the majority of stretching and bending signals.

Fingerprint region usually covers majority of the bending vibrations of the molecule between the regions 1500-500 cm-¹.