20. 下列何者結構具有對掌性質(chirality)?
(A) 2,4-Dimethylheptane
(B) 5-Ethyl-3,3-dimethylheptane
(C) cis-1,3-Dimethylcyclohexane
(D) 4-Methylcyclohexanone
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統計: A(358), B(38), C(50), D(21), E(0) #2751825
統計: A(358), B(38), C(50), D(21), E(0) #2751825
