In which of the following molecules the van der Waals forces are likely to be the most important in determining the mpt. and b.pt.?

Options

A. CO
B. `H_(2) S `
C. `Br_(2)`
D. HCl

Answer

c

Explanation

`Br_(2)` is a non-polar molecular and hence its melting
and boiling point depend only upon an der waals
forces of attraction while all the remaining molecules
have dipole moments and hence their melting and
boiling points depand upon dipole-dipole attraction .