[普化] 一題命名..

[cheyu (下雨天 蹺課天)]

What is the nameing of the following molecule?
CH2CH2CH2CH3CH3CH2CH2CH2CHCH2CH3
（A）isodecane
 (B)2-butyiheptane
(C)5-ethylnonane
(D)isoundecane
(E)以上皆非
謝謝︿︿

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