Which of the following has the highest boiling point

Options

(a) n-octane
(b) Butane
(c) Pentane
(d) Ethane

Correct Answer:

n-octane

Explanation:

Among n-octane, butane,pentane,and ethane,the first one contains highest number of ‘C’ atoms in its molecule and again it is the straight chain isomer, so it has highest boiling point among them. As it has highest molecular mass so vanderwaals force of attraction is maximum between the n-octane molecules.