The intermolecular forces of attraction (i.e., H-bonding and van der waal's forces) exist among polar and non-polar species which effect melting point, boiling point, solubility and viscosity of covalent compounds :
Q. Melting and boling points of halogen increase down the group due to

Options

A. Increase in London dispersion forces
B. Increase in extent of polarity
C. Increase in Molecular mass
D. Both (a) and (b)

Answer

D

Explanation

`to` Halogens are non-polar species, hence London dipersion forces act among them and these forces are directly propotional to molecular weight.
`to`London dispersion forces `prop`B.P and M.P in such non-polar species.