1. Which of these dienes is the most reactive in the Diels-Alder reaction?
(A) 1,3-Butadiene
(B) 1,4-Pentadiene
(C) 2,3-Dimethyl-1,3-butadiene
(D) 1,2-Butadiene
(E) 1,4-Cyclohexadiene

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統計： A(0), B(0), C(0), D(0), E(1) #3856531