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Which molecules show Keesom Forces?

Polar molecules show Keesom forces. Polar molecules have heteroatoms that differ in electronegativity values such that the electronegativity difference between the two atoms in a polar covalent bond is greater than 0.5 but less than 1.7. For example, HF, HCl, R-OH, etc.

Due to their electronegativity difference, the bond electrons are distributed unequally, creating a charge separation or a dipole. The dipoles orient so that the negative end of the dipole electrostatically attracts the positive end of the neighboring polar molecule. These dipole-dipole interactions are known as Keesom Forces, a type of Vander Waal, and are a primary way of interaction in polar molecules.

 

Related Reading- 

What is electronegativity 

Introduction to Vander Waal Forces 

Keesom force 

Difference between Polar and Nonpolar Covalent bond

 

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