Q.

The pair from the following pairs having both compounds with net non-zero dipole moment is          [2023]

1 1,4-Dichlorobenzene, 1,3-Dichlorobenzene  
2 Benzene, anisidine  
3 CH2Cl2, CHCl3  
4 cis-butene, trans-butene  

Ans.

(3)