Among the following the compounds , the one that is polar and has central atom with `sp^(2)` hydridisation is

Options

A. `H_2CO_3`
B. `SiF_4`
C. `BF_3`
D. `HClO_2`

Answer

C

Explanation

`SIF_4 and HClO_2` have `sp^3`-hybridization while `H_2CO_3` and `BF_3` have `sp^2`-hybridization.

The resultant dipole moment of two B-F bonds is equal and opposite to the dipole moment of third B-F bond. Hence `BF_3` is non polar molecule. In contrast, the dipole moment of two C-OH hands is not equal to that of C=O bond and hence `H_2CO_3` has a resultant dipole moment and thus is a polar molecule.