Question

The \[{{\text{H}}_2}{{\text{O}}_2}\] has the boiling point than water due to stronger hydrogen bonding
A.True
B.False

Answer 1

Hint: Extent of hydrogen bonding is more in case of hydrogen peroxide as compared to water. Also the polarizability of hydrogen peroxide is more than water due to greater dipole moment. The compounds having stronger intermolecular force of attraction have greater value of melting and boiling point.

Complete step by step answer:
Hydrogen bonding is an electrostatic attractive force between covalently, bonded hydrogen atoms of one molecule and an electronegative atom like fluorine, oxygen and nitrogen. It is not formed in ionic compounds and forms in polar covalent compounds. It's a weak bond but stronger than van der waal force. For this, hydrogen should be bonded with high electronegative element like fluorine, oxygen and nitrogen. Boiling points and melting points of compounds increase due to intermolecular hydrogen bonding. Sudden increase in boiling point of ammonia, water and HF is due to hydrogen bonding. Intramolecular hydrogen bonding gives rise to ring formation, so the force of attraction among these molecules are van der waal force and so melting and boiling point are low for these compounds.
\[{{\text{H}}_2}{{\text{O}}_2}\] has boiling point of about \[{150^o}{\text{C}}\] and boiling point of water is \[{100^o}{\text{C}}\] . This difference in their boiling point can be attributed by variation in strength of intermolecular forces. As hydrogen peroxide has greater polarizability, stronger London dispersion force, and greater dipole moment as compared to water. Hydrogen peroxide exhibits hydrogen bonding more as compared to water which greatly impacts on its boiling point. The bottom line is that all three types of intermolecular forces are stronger for hydrogen peroxide than water which accounts for the greater boiling point of hydrogen peroxide than water.

Thus, the correct option is A.

Note:
Dipole moment of hydrogen peroxide is \[2.26{\text{Debye}}\] and on the other hand, dipole moment of water is \[1.86{\text{Debye}}\] . Greater dipole moments correspond to the greater polarizability of the compound or molecule.