The correct option is
B SF4For permanent dipole moment, we have to check the resultant dipole moment vectors in each case.
SiF4 - tetrahdral, symmterical.
So, the resultant dipole moment vector is zero
μ=0.
SF4 - see saw shaped.
So, the resultant dipole moment vector is non zero
μ≠0.
XeF4 - square planar, symmterical.
So, the resultant dipole moment vector is zero
μ=0.
BF3 - trigonal planar, symmterical.
So, the resultant dipole moment vector is zero
μ=0.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/786042/original_2.png)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/786043/original_2_1.png)
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/786044/original_2_2.png)