81. Which of the following cycloalkenes would be expected to be stable?
(A) f and ff
(B) ff and fff
(C) ff
(D) f and fff
(E) All are stable.
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統計: A(1), B(2), C(1), D(9), E(1) #3429600
統計: A(1), B(2), C(1), D(9), E(1) #3429600