Solution (Step-by-step):
The London (dispersion) force is one of the intermolecular forces which is weakest in nature. It is also a temporary attractive forces where generated the temporary dipoles. It is also called induced dipole-induced dipole attraction.
The nature of the given atom and molecules are shown below ---
HCl : Here, we can see that electronegativity difference is present between H and Cl. Hence, a permanent dipole moment is present in this molecule. It is polar molecule. Therefore, it shows dipole-dipole forces.
Cl2 : The two Cl atoms are joined each other to form the molecule Cl2. No electronegativity difference is present. It is non-polar molecule as the two same Cl atoms are connected with same electronegativity. So, Cl2 shows the London (dispersion) forces.
He : He is an atom of Group 18 of the modern periodic table. So, He shows the London (dispersion) forces.
H2O : The electronegativity difference between H and O is more, which concludes the H2O molecule is polar in nature. So, hydrogen bonding in this molecule is more powerful which results the H2O molecule shows the hydrogen bonding forces.
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