b. I=3 sig., II=4 sig., III=4 sig., IV=5 sig.

c. I=2 sig., II=2 sig., III=3 sig., IV=4 sig.

d. I=2 sig., II=4 sig., III=5 sig., IV=6 sig.

e. I=2 sig., II=3 sig., III=4 sig., IV=5 sig.

Solution: What is the correct assignment of the number of signals in the 13C NMR spectra of the following compounds?
a. I=2 sig., II=4 sig., III=3 sig., IV=4 sig.
b. I=3 sig., II=4 sig., III=4 sig., IV=5 sig.

What is the correct assignment of the number of signals in the ^{13}C NMR spectra of the following compounds?

a. I=2 sig., II=4 sig., III=3 sig., IV=4 sig.

b. I=3 sig., II=4 sig., III=4 sig., IV=5 sig.

c. I=2 sig., II=2 sig., III=3 sig., IV=4 sig.

d. I=2 sig., II=4 sig., III=5 sig., IV=6 sig.

e. I=2 sig., II=3 sig., III=4 sig., IV=5 sig.