i never had a C13 question, but my gf did. she said hers asked her how many different sets of peaks would be present in a particular molecule. I, however, had 2-3 q's asking about HNMR and IR. The HNMR asked how many C's would see x # of peaks, and my IR was asking which compound would show a ______ peak at xxxxx nm and ________ peak at xxxx nm. i've never actually seen a pic of the specs them selves, nor have i heard of anyone that did.