烷烃2,3,4,5,5-五甲基庚烷是稀烃A与H2发生加成反应后的产物,则稀烃A可能的结构简式

C
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C-C-C-C-C-C-C (2,3,4,5,5-五甲基庚烷)
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C C C C
有九种可能
C
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C=C-C-C-C-C-C (1)
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C C C C
C
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C-C=C-C-C-C-C (2)
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C C C C
C
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C-C-C=C-C-C-C (3)
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C C C C
C
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C-C-C-C-C-C-C (4)
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C C C C
C
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C-C-C-C-C-C-C (5)
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C C C C
C
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C-C-C-C=C-C-C (6)
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C C C C
C
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C-C-C-C-C=C-C (7)
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C C C C
C
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C-C-C-C-C-C=C (8)
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C C C C
C
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C-C-C-C-C-C=C (9)
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C C C C