分子式为C5H12的同分异构体有：CH3CH2CH2CH2CH3；CH3CH2CH2CH2CH3；CH3CH2CH2CH2CH3；CH3CH（CH3）CH2CH3；CH3CH（CH3）CH2CH3；CH3CH（CH3）CH2CH3；CH3CH（CH3）CH2CH3；CH2C（CH3）2CH3；
分子式为C5H11OH醇的同分异构体有：CH3CH2CH2CH2CH2OH；CH3CH2CH2CHOHCH3；CH3CH2CHOHCH2CH3；CH3CH（CH3）CH2CH2OH；CH3CH（CH3）CHOHCH3；CH3COH（CH3）CH2CH3；CH2OHCH（CH3）CH2CH3；CH2C（CH3）2CH2OH，共有8种情况．
故选C．
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