Question

arrange the three isomers of pentane in increasing order of their boiling point.

Answer 1

Isomers of pentane are
n-pentane, isopentane and neopentane.
Boiling point is inversely proportional to branching.
Order of BP:
Neopentane < isopentane < n-pentane

Answer 2

Hey dear,

● Answer -
Boiling point of pentane isomers is in order -
neopentane < isopentane < n-pentane

● Explanation -
Pentane has 3 structural isomers -
n-pentane => CH3-CH2-CH2-CH2-CH3
isopentane => CH3-CH2-CH(CH3)2
neopentane => C(CH3)4

Due to branching, molecules get contracted and associated van der Waal's forces gets weakened. Thus boiling point decreases with increase in branching.

Therefore, boiling point of pentane isomers is in order -
neopentane < isopentane < n-pentane





Hope this helps you...