Both `CH_(4)` and `C Cl_(4)` are non-polar molecules, but `CHCl_(3)` is a polar molecule. Discuss.

Explanation

(i) bonds present in the molecule of `CH_(4), C Cl_(4)` and `CHCl_(3)` and their polarity
(ii) bond moments of C-H and C-Cl bonds
(iii) shapes of the respective molecules
(iv) influence of the shape on the molecule of the net dipole moment.