己烷的结构式？

360问答CH3-CH2-CH2-CH2-CH2-CH3 正己烷
CH3-CH-CH2-CH2-CH3 2甲基办政阳雨预戊烷
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CH3
CH3-CH2-CH-CH2-CH3 3甲基戊烷
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CH3
CH3-CH-CH-CH3 2,3二甲基丁烷
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CH3 CH3
CH3
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CH3-C-CH2-CH3 对二甲基丁烷
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CH3