O  H single bond N  H single bond C  H single bond C ≡ C C ≡ N C=O C=N C=C C  C C  N C  O Fingerprint Region Bonds to H Triple bonds Double bonds Single Bonds 4000 cm -1 2700 cm -1 2000 cm -1 1600 cm -1 400 cm -1 The four primary regions of the IR spectrum
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