Boiling point of water is higher than that of ${\mathrm{O}}_2$ because the ${\mathrm{H}}_2\mathrm{O}$ molecule has

Boiling point of water is more than ${\mathrm{O}}_2$   because in water molecules hydrogen bonding is present.  In order to break H-bonding between water molecules, greater amount of energy must be provided. Hence, the boiling point of water is high. But in ${\mathrm{O}}_2$  molecule there is no H-bonding. Therefore, ${\mathrm{O}}_2$  has low boiling point than water.