CHM 2120 : 2120 Blackboard problem set 3 2013 Answers - Spectroscopy.pdf
Document Summary
Problem set 3 answers: associate each of the following ir spectra with one of the following compounds and, propanoic acid: look for a carbonyl stretch and a broad oh stretch, 2-pentanol: look for an oh peak (broad). No carbonyl peak, no sp2 ch"s: benzyl alcohol; look for an oh peak and sp2 ch"s. No carbonyl peak: acetophenone: look for a carbonyl peak and sp2 ch"s. No other key groups: 4-methylpentanenitrile: look for a c(cid:0)n. no oh, c=o or (cid:0)ch, p-acetylbenzonitrile: look for c=o, sp2 ch"s and c(cid:0)n. no (cid:0)ch. Note: the key functional groups must be identified. Identifying the peaks on the spectrum directly is an straightforward way to do this. 4: give the number of peaks expected for the indicated protons in each of the. Note: s = singlet, d = doublet, t = triplet, q = quartet a) b) O: how many signals would be expected in the following molecules? a) c) b)
