5. Compound X has a molecular formula of C7H16. In 13C NMR, compound I gave 3 peaks and in 1H NMR it also gave 3 peaks, a doublet, a triplet and a multiplet. Provide a structure for compound I. ( 1 point) 6. Deduce the identity of the following compound from the 1H NMR data given. C8H10O: 3.4(3H, singlet ),4.5(2H, singlet ),7.2(5H,m)(ppm) ( 1 point) 7. How many 13C-signals are possible for the following molecules? (1 point)