1.

Whichone of the following has the highest dipole moment ? (i) CH_(2)Cl_(2) "" (ii) CHCl_(3) "" (iii) C Cl_(4) .

Answer»

SOLUTION :The three dimensional STRUCTURES of the three COMPOUNDS along with the direction of dipole moment in each of there are given below :

`C Cl_(4)`being symmetrical has zero dipole MOMENTS . In `CHCl_(3)` , the resultant of two `C - Cl` dipoles is opposed by the resultant of C - H and C - Cl bond. Since the latter resultant isexpected to be smaller than the former, `CHCl_(3)` hasafinite smaller dipole (`1.03`D) moment .
In `CH_(2)Cl_(2)`, the resultant of two C - Cl dipole moments is in the same direction as the resultant of two C - H dipoles. Therefore , `CH_(2)Cl_(2) (1.62 D)` has a dipole moment higher than that of `CHCl_(3)`.
Thus , `CH_(2)Cl_(2)` has the highest dipole moment .


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