19. Which of the following acid derivatives has the highest IR stretching frequency for carbonyl group?
(A) y-butyrolactone
(B) P-propiolactam
(C) 8-valerolactone
(D) y-butyrolactam
(E) nitrile.
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統計: A(1), B(0), C(1), D(0), E(1) #2823983
統計: A(1), B(0), C(1), D(0), E(1) #2823983