adspace
The reduction-oxidation (Redox) potentials of NADH and FADH2
show that the following reaction is spontaneous:
a) FADH2 + NAD+ --> FAD + NADH
b) FADH2 + NADP+ --> FAD + NADPH
c) NADH + FAD --> NAD+ + FADH2
d) Reactions a) and b) are both spontaneous