4. Which compound is a free-radical initiator?
(A) ethyl benzoate
(B) isopropyl benzoate
(C) n-propyl benzoate
(D) methyl benzoate
(E) azobisisobutyronitrile (AIBN)

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統計： A(1), B(0), C(1), D(0), E(2) #2055421