应该没有C5H11吧!
如果是C5H12,就是CH3CH2CH2CH2CH3
CH3CH(CH3)CH2CH3
C(CH3)4
若是C5H10,就是CH2=CHCH2CH2CH3
CH3CH=CHCH2CH3
CH2=C(CH3)CH2CH3
CH2=CHCH(CH3)CH3
(CH3)2C=CHCH3
CH2=C(CH3)3