Hydrogen bond is the given to the relatively weak secondry interaction between a hydrogen atom bound to an electronegative atom and another atom which is also generally electronegative and which has one or more lone pairs and can thus acts as a base. We can give the follwoing generalized representation of hydrogen bond.
`overset(delta-)(X)-overset(delta+)(H)...Y`
Bond dissociation energy of H-bond ranges from 8 and 42kJ/ol, and the most commonly encountred hydrogen bonds are `O-H...O, N-H...O and F-H..E`.
Q.Which of the following interaction has energy between 8-42kJ/mol?

Options

A. `Na^(+):C Cl_(4)`
B. `CHCl_(3):Br^(-)`
C. `C_(6)H_(6):C Cl_(4)`
D. `H_(2)O: HCN`

Answer

D

Explanation

`Na^(+):C C_(4)`: ion-induced dipole `lt8`kJ/mol
`CHCl_(3):Br`: Weaker ion-dipole `lt8`kJ/mol
`C_(2)H_(6)`: London dipersion forces`lt8`kJ/mol
`H_(2)O:HCN`: Unsymmetrical H-bond :8-42kJ/mol