Which one of the following has the highest dipole moment: (1). `CH_(2)Cl_(2)` (2). `CHCl_(3)` (3) `CCl_(4)`

Explanation

The three dimensional structures of the three compounds along with the directions of different bond moments are shown below:

Due to the symmetrical structure, the dipole moment of `C Cl_(4)` is zero. In compound (1). The resultant of two C-H bond moments. But in compound (2), the resultant of two C-Cl bond mements is reinforced by one C-H bond moment but opposed by a third C-Cl bond moment. this shows that the dipole moment of `CH_(2)Cl_(2)` is greater than that of `CHCl_(3)`. Thus, `CH_(2)Cl_(2)` has the highest dipole moment.