H AND 13C NMR

1) Would it better to use 1H NMR or 13C NMR spectroscopy to distinguish compounds H-J? Explain your answer (HINT: think about # of signals produced)

2) The coupling constant for protons in the compound shown below are Jab=10 and Jac=6

Identify protons A,B, and C

3) Propose a structure that is consistent with following molecular formula and 1H NMR

data: Molecular Formula C5H10O

Clearly label (a,b, … so on) all protons and assign the chemical shifts, in your proposed structure