Question

$C_3{H}_6,C_4{H}_8$ and $C_5{H}_{10}$ belong to the same homologous series.
Arrange these hydrocarbons in order of increasing boiling points.

Answer 1

• The boiling point of the hydrocarbons increases with the increasing molecular mass.
• As molecular mass increases the intermolecular force of attractions (Van der Waal's force and London force) increases that require a higher amount of energy to break the bond.
• Therefore, the correct order is $C_3{H}_6$<$C_4{H}_8$<$C_5{H}_{10}$