阿摩線上測驗
66. Structure I-IV may represent a conformation of 2,2-difluorobutane sighting along any C-C bond. Please pick up right
structures. 
(A) I, II, III
(B) II, III, IV
(C) I, II, IV
(D) all of the above
(E) none of the above
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統計： A(1), B(2), C(20), D(3), E(2) #1026951
統計： A(1), B(2), C(20), D(3), E(2) #1026951
