In the proton NMR spectrum of a secondary amide, the amide proton's signal is:
A) sharp, around δ 5.0 (ppm) .
B) sharp, around δ 10.0 (ppm) .
C) broad, around δ 9.0 (ppm) .
D) broad, around δ 7.0 (ppm) .
E) usually not observed.
Correct Answer:
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