Discussion
The region below about 1500 reciprocal centimetres is called the fingerprint region because it
Answer: B
Correct answer: is characteristic of the molecule as a whole
Below about 1500 reciprocal centimetres the spectrum is dominated by skeletal bending and stretching modes that involve the whole molecular framework rather than any one group, so the pattern is complex and, like a fingerprint, effectively unique to the compound. It is therefore used for identification by comparison with a reference spectrum, while the region above 1500 is used to identify functional groups.
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