4. Dieldrin, C12H8Cl6O, is a pentacyclic compound formerly used as an insecticide. How many double bonds does dieldrin have?
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5

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統計: A(5), B(1), C(1), D(3), E(4) #1036990

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