The decreasing order of boiling points is

Question

The decreasing order of boiling points is (A) neo-pentane > iso-pentane >n -pentane (B) iso-pentane >n -pentane > neo-pentane (C) n - pentane > iso-pentane > neo-pentane (D) n -pentane > neo-pentane > iso-pentane

Tardigrade Admin · Accepted Answer

For isomeric alkanes, with branching the surface area of the molecule decreases and hence van der Waals force of attraction is less. So, boiling point decreases with branching of alkanes. Therefore, the decreasing order of boiling point of pentanes is n -pentane > iso-pentane > neo-pentane.

Q. The decreasing order of boiling points is

neo-pentane $>$ iso-pentane $> n$ -pentane

iso-pentane $> n$ -pentane $>$ neo-pentane

$n$ - pentane $>$ iso-pentane $>$ neo-pentane

$n$ -pentane $>$ neo-pentane $>$ iso-pentane

For isomeric alkanes, with branching the surface area of the molecule decreases and hence van der Waals force of attraction is less. So, boiling point decreases with branching of alkanes. Therefore, the decreasing order of boiling point of pentanes is $n$ -pentane $>$ iso-pentane $>$ neo-pentane.