Question

Which is strong hydrogen bond or vander waal force...?

Answer 1

A hydrogen bond represents a dipolar attraction between hydrogen atom & highly electronegative atom. The hydrogen bond is represented by ----------(dotted lines).


For eg H -----------X -----------X -------- X------

X = O,N,S,F,Cl….

The bond pair involved in hydrogen bonding was attracted more towards higly electronegative atom, as a result H atom will start acquiring a partial positive charge(δ+) & the electronegative atom will acquire a partial negative charge(δ-).

The magnitude of H-bonding is maximum in the solid state and minimum in the gaseous state.

Hydrogen bonds are of two types

(i) Intermolecular H-bond e.g., HF, H2O etc.

(ii) Intramolecular H-bond e.g., o-nitrophenol



Vander waal’s forces are weak forces and exist in non polar compounds & noble gases As compared to hydrogen bonds they are weak in nature because of strong dipole dipole interaction in hydrogen bonding.

so hydogen bond are stronger