每日一练ALevel Chemistry」
知识点
Isomers
例题
Kerosene is used as an aircraft fuel. Q is one of the molecules in kerosene and has the skeletal formula shown.
Other structural isomers of this molecule are also found in kerosene.
Which structure is a structural isomers of Q?
解析
Answer: D
解析:
Structural isomer: compounds with the same molecular formula but different structural formulae.
Q的skeletal formula数有几个顶点,即有几个C. (共有10个顶点,10个C),longest straight chain上有7个C, branch(从右往左数)在C1 (methyl), C2 (methyl)和C4 (methyl)上
红线部分为longest straight chain.
选项A也有10个顶点,molecular formula相同;longest straight chain上(从左往右数)有7个C, branch在C1 (methyl), C2 (methyl)和C4 (methyl)上,选项A和Q structural formula相同。
选项B有9个顶点,molecular formula不同。
选项C有11个顶点,molecular formula不同。
选项D有10个顶点,molecular formula相同。longest straight chain上(从左往右数)有7个C, branch在C2 (isopropyl)上,选项D和Q structural formula不同。
所以选D.
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Correct Answer: D
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