HF has the highest boiling point among hydrogen halides because it has :

  • Option 1)

    Strongest vander waals interaction 

  • Option 2)

    Lowest ionic character 

  • Option 3)

    Strongest hydrogen bonding

  • Option 4)

    Lowest dissociation enthalpy

Answers (1)

 

Hydrogen Bonding -

It is an electrostatic attractive force between hydrogen of one molecule or part of an molecule and an electronegative atom ( F, O, N ) of another molecule (intermolecular ) or another part of same molecule ( intramolecule )

- wherein

 

 

Hydrogen Bonding -

Attractive force which binds hydrogen atom of one molecule with the electronegative ( F, O, N ) atom of another molecule.

- wherein

It is of two type

1.  Intermolecular and 

2.  Intramolecular

 

 

Strenght of Hydrogen bond -

Electrostatic force > covalent bond > H bond > Vander Wall's force

- wherein

H bond is a very weak bond and its strength is intermediate between the weak Vander wall force and strong covalent force.

 

 

 

 

B.P. order is HF>HI>HBr>HCl

due to hydrogen bonding in HF  , it has high B.P. then other halides.

H-F---H-F


Option 1)

Strongest vander waals interaction 

Option 2)

Lowest ionic character 

Option 3)

Strongest hydrogen bonding

Option 4)

Lowest dissociation enthalpy

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