27. 下列何者為 4-isopropyloctane 的 Constitutional isomers? I: 4-ethyl-2-methyloctane II: isobutylcyclohexane III: 4-ethyl-2,2-dimethylheptane IV: 3-ethyl-2,4,5-trimethyloctane
(A) I, II
(B) II, III
(C) I
(D) I, III

題目解析題目要求找出 4-isopr...