17. Which of the following combinations of peaks appears in the 1H NMR spectrum of 1, 4-dimethyoxyethane, CH3OCH2CH2CH2CH2OCH3? three singlets с a. b. a singlet, a triplet, and a quintet c. a singlet and two triplets d. a doublet and a triplet 14. Which of the following combinations of peaks appears in the 'H NMR spectrum of butane? a. a triplet and a doublet b. a triplet and a quartet c. a triplet and a sextet d. two singlets