单选题下列各组中的物质，既不是同素异形体，又不是同分异构体的是（ ）．A乙醇和乙醛B乙酸和甲酸甲酯C金刚石和石墨D氧气和臭氧
单选题
下列各组中的物质，既不是同素异形体，又不是同分异构体的是（ ）．
A
乙醇和乙醛
B
乙酸和甲酸甲酯
C
金刚石和石墨
D
氧气和臭氧
参考解析
解析：
A项，乙醛和乙醇既不是同素异形体也不是同分异构体；B项，乙酸和甲酸甲酯是同分异构体；C项，金刚石和石墨是同素异形体；D项，氧气和臭氧是同素异形体．
A项，乙醛和乙醇既不是同素异形体也不是同分异构体；B项，乙酸和甲酸甲酯是同分异构体；C项，金刚石和石墨是同素异形体；D项，氧气和臭氧是同素异形体．
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