Which of the following is FALSE regarding the FT-IR signal of N-H in amines? Select one:
a. The spectrum of dimethylamine has this signal
b. Primary amines show two N-H signals for symmetric and asymmetric stretch
c. The N-H signal is in the region between 3100 -3500 cm–1
d. Secondary amines show only one N-H signal
e. The spectrum of triethylamine has this signal