Define hydrogen bond. Is it weaker or stronger than the van der Waals forces?

Asked by Pragya Singh | 1 year ago |  139

##### Solution :-

A hydrogen bond is defined as an attractive force acting between the hydrogen attached to an electronegative atom of one molecule and an electronegative atom of a different molecule (may be of the same kind). Due to a difference between electro-negativities, the bond pair between hydrogen and the electronegative atom gets drifted for away from the hydrogen atom. As a result, a hydrogen atom becomes electropositive with respect to the other atom and acquires a positive charge.

$$4^δ–X^δ………..H^{δ+}–X^{δ−}………….H^{δ+–}X^{δ−}$$

The magnitude of H-bonding is maximum in the solid state and minimum in the gaseous state.
There are two types of H-Bonds:
(i)  Intermolecular H-bond e.g., HF, $$H_2O$$ etc.
(ii) Intramolecular H-bond e.g., o-nitrophenol

Hydrogen bonds are stronger than Vander Walls forces since hydrogen bonds are regarded as an extreme form of dipole-dipole interaction.

Answered by Abhisek | 1 year ago

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