Finally, the fingerprint region is 1500 - 600 cm -1 , where all the single bonds will be found with the exception of some of the bonds to hydrogen that are found in the hydrogen bond region. For alken...Finally, the fingerprint region is 1500 - 600 cm -1 , where all the single bonds will be found with the exception of some of the bonds to hydrogen that are found in the hydrogen bond region. For alkenes, there will be a Csp 2 -H peak in the hydrogen bond region (if there are hydrogens attached to the double bond carbons as in this case) and the C=C bond. The notable peaks for the alkyne are the peak greater than 3000 cm -1 and the peak in the triple bond region.
