The pair from the following pairs having both compounds with net non-zero dipole moment is

The dipole moment is the vector sum of all the bond moments. The ${\mathrm{CH}}_2{\mathrm{Cl}}_2$ and ${\mathrm{CHCl}}_3$ both have net non-zero dipole moment because the bond moments are not cancelled each other due to their tetrahedral structure. The $1, 4$-dichlorobenzene, trans-butene, benzene have zero dipole moment due to cancellation of bond moments. The $1, 3$-dichlorobenzene, cis-butene, anisidine has non-zero dipole moment.