Ето ти за хексан, на английски е, ама нищо:
Isomers
Hexane has five isomers:[3]

Hexane, CH3CH2CH2CH2CH2CH3, a straight chain of six carbon atoms.
2-Methylpentane (Isohexane), CH3CH(CH3)CH2CH2CH3, a five-carbon chain with one methyl branch on the second.
3-Methylpentane, CH3CH2CH(CH3)CH2CH3, a five-carbon chain with one methyl branch on the third.
2,3-Dimethylbutane, CH3CH(CH3)CH(CH3)CH3, a four-carbon chain with one methyl branch on the second and third.
2,2-Dimethylbutane (neohexane) , CH3C(CH3)2CH2CH3, a four-carbon chain with two methyl branches on the second.
Пък за пентин нищо немога да намеря..