Among the following, the molecule which has highest dipole moment is

The molecules ${\mathrm{CH}}_4$  and ${\mathrm{CCl}}_4$  have tetrahedral geometry. So, they have zero dipolmoment.

The chloroform has tetrahedral geometry but the net dipole moment is not equal to zero.

In halogen, chlorine Cl has more electronegative than iodine, I. So, chloroform ${\mathrm{CHCl}}_3$  Has more dipole moment than ${\mathrm{CHI}}_3$ .