Q.

Polar molecular are the molecules                [2021]

1 having a permanent electric dipole moment.  
2 having zero dipole moment.  
3 acquire a dipole moment only in the presence of electric field due to displacement of charges.  
4 acquire a dipole moment only when magnetic field is absent.  

Ans.

(1)

The polar molecules are the molecules have one end slightly positive and other end is slightly negatively charged separated by some distance.
So, they have permanent electric dipole moment.