The general formula for and are cnh2n+2 and cnh2n , respectively. axial and equatorial hydrogen atoms are interconverted during a . the anti conformation is in energy than a gauche conformation. the increase in energy when tetrahedral bond angles deviate from the optimum angle of 109.5° is known as strain.

The general formula for alkane and cycloalkane are and , respectively.

Axial and equatorial hydrogen atoms are inter-converted during a ring flip .

The anti conformation is lower in energy than a gauche conformation.

The increase in energy when tetrahedral bond angles deviate from the optimum angle of 109.5° is known as angle strain.

Now,

Alkanes are saturated hydrocarbon with general formula and cycloalkanes are also saturated cyclic hydrocarbons where carbons are linked  in the form of a ring with general formula .

The phenomenon which involves the inter-conversion of axial hydrogen atoms into equatorial hydrogen atoms is said to be ring flip.

The energy of the anti conformation is lower than the gauche conformation due to steric strain, which is lower in anti conformation and results in low energy.

The increase in potential energy of the molecule because of the deviation of bond angles from its original values is said to be angle strain.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.