The molecule which have zero dipole moments is .

Options

A. `CH_(2)CI_(2)`
B. `BF_(3)`
C. `NF_(3)`
D. `CIO_(2)`

Answer

B

Explanation

Dipole momnet of compound having regular geometry and same type of atoms is zero It is a vector quantity The zero dipole momnet of `BF_(3)` is due to its symmetrical (triangular planar ) structure The three F-atoms lie at the corners of an equilateral triangle with B-atom at the centre Thus the vectorial addition of the dipole momnet of the three bonds gives a net sum of zero because the resultant of any two dipole monet is equal and opposite to the third The `mu_(NH_(3)) =1.46 D` indicating its unsymmetrical structure The `mu_(CH_(2))CI_(2)=1.57 D` The molecule uses `sp^(3)` hybridisation but is not symmetrical .