Molecule with dipole moment among the following

PCl₃ has trigonal pyramidal structure due to the presence of the lone pair on P, So It has dipole moment.

SF₆ forms an octahedral structure i.e. symmetrical shape, So individual dipoles get cancelled, therefore, net dipole is zero.

CCl₄ is non polar molecule because the central carbon atom undergoes sp³ hybridization which results in regular tetrahedral geometry in which all the four bond dipoles cancel each other. Hence, the dipole moment is zero.

BF₃ forms trigonal planar structure i.e. symmetrical shape, So individual dipoles get cancelled, therefore, net dipole is zero.