Discussion
Match each group with its characteristic wavenumber.
List I
A. Hydroxyl stretch
B. Carbonyl stretch
C. Nitrile stretch
List II
P. About 3300, broad
Q. About 1700, strong
R. About 2250, sharp
Select the correct match.
Answer: C
The pairing is A-P, B-Q, C-R, and each entry carries a shape as well as a position - broad, strong and sharp respectively. Reading both together is what distinguishes a hydroxyl from an amine at nearly the same wavenumber, and it is why a table of group frequencies always quotes intensity and shape alongside.
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