56. Which of the following amines will react with cyclopentanone to form an enamine?
(A) CH3(CH2)3NH2
(B) (CH3)3N
(C) pyridine
(D) (CH3)3CNH2
(E) none of the above 

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統計： A(0), B(1), C(0), D(1), E(2) #2347832