�
n
-Butane
CH
3
CH
2
CH
2
CH
3
�
Isobutane
(CH
3
)
3
CH
bp -0.4�C
bp -10.2�C
CH3CH2CH2CH3CH3CH2CH2CH3(CH3)3CH(CH3)3CHCH3CH2CH2CH3(CH3)3CH