11. Which of the following alkenes exhibit E-Z isomerism?
I. 1-chloropropene II. 2-chloropropene III. 3-chloropropene
(A) only I
(B) I and II
(C) I and II
(D) I and IIl

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統計： A(1), B(0), C(0), D(0), E(0) #2788980