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 IIl
(D)I and III

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統計： A(2), B(2), C(0), D(0), E(0) #2999397