每日一練ALevel Chemistry」
知識點
Isomers
例題
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數有幾個頂點,即有幾個C. (共有10個頂點,10個C),longest straight chain上有7個C, branch(從右往左數)在C1 (methyl), C2 (methyl)和C4 (methyl)上

紅線部分為longest straight chain.
選項A也有10個頂點,molecular formula相同;longest straight chain上(從左往右數)有7個C, branch在C1 (methyl), C2 (methyl)和C4 (methyl)上,選項A和Q structural formula相同。
選項B有9個頂點,molecular formula不同。
選項C有11個頂點,molecular formula不同。
選項D有10個頂點,molecular formula相同。longest straight chain上(從左往右數)有7個C, branch在C2 (isopropyl)上,選項D和Q structural formula不同。
所以選D.
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Your turn

(答案見下方)
Correct Answer: D
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