The NMR spectrum of cinnamaldehyde follows. (a) Determine the chemical...

The NMR spectrum of cinnamaldehyde follows.

(a) Determine the chemical shifts of H^a, H^b,and H^c. The absorption of one of these protons is difficult to see; look carefully at the integrals.

(b) Estimate the coupling constants J_ab and J_bc

(c) Draw a tree to analyze the complex splitting of the proton centered at δ 6.7.