12．仔细分析下列表格中烃的排列规律，判断排列在第15位烃的分子式是 1 2 3 4 5 6 7 8 9 ……
(C)2H2
(C)2H4
(C)2H6
(C)3H4
(C)3H6
(C)3H8
(C)4H6
(C)4H8
(C)4H10 ……
(A)
(C)6H12
(B)
(C)6H14
(C)
(C)7H12
(D)
(C)7H14

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