The correct order of increasing boiling points is

Options

A. n-butane lt 1-butanol lt n-butyl chloride lt isobutane
B. n-butane lt isobutane lt n-butyl chloride lt 1-butanol
C. isobutane lt n-butyl chloride lt n-butane lt 1-butanol
D. isobutane lt n-butane lt n-butyl chloride lt 1-butanol.

Answer

D

Explanation

Increase in branching decreases surface area of the molecule and therefore, results in lesser Van der Waal's forces . Consequently, isobutane has lesser boiling point than n-butane. Alkyl chlorides have higher boiling than corresponding alkanes because they are polar and stronger dipole-dipole force operate between the molecules of alkyl chloride. Alcohols have higher boiling point than corresponding alkyl chloride, because alcohols molecules are associated through strong H-bonds