Для C5H12:

n-Pentane: CH3-CH2-CH2-CH2-CH32-Methylbutane: CH3-CH(CH3)-CH2-CH3

Для C6H14:

n-Hexane: CH3-CH2-CH2-CH2-CH2-CH32-Methylpentane: CH3-CH2-CH(CH3)-CH2-CH33-Methylpentane: CH3-CH(CH3)-CH2-CH2-CH3