請教有機化學問題
1、which of the following is a meso compound?
(A)trans-1,4-dimethylcyclohexane
(B)cis-1,3- dimethylcyclohexane
(C)trans-1,3- dimethylcyclohexane
(D)cis-1,4-dimethylcyclohexane
(E)trans-1,2- dimethylcyclohexane
答案是 B
那請問A和D為什麼錯呢?
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