已知戊醇(C5H12O)共有8种属于醇的同分异构体,请回答:
(1)戊醇的这8种同分异构体中能氧化成醛的有4种,它们是:CH3(CH2)3CH2OH和(写结构简式)____________________________________________________________________
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(2)戊醇的这8种同分异构体脱水后可得________种烯烃.