Question

Which of the following has a permanent dipole moment?

• A. $Si{F}_4$
• B. $S{F}_4$
• C. $Xe{F}_4$
• D. $B{F}_3$

Answer 1

The correct option is B $S{F}_4$

For permanent dipole moment, we have to check the resultant dipole moment vectors in each case.

$Si{F}_4$ - tetrahdral, symmterical.
So, the resultant dipole moment vector is zero $\mu =0$.

$S{F}_4$ - see saw shaped.
So, the resultant dipole moment vector is non zero $\mu \ne 0$.

$Xe{F}_4$ - square planar, symmterical.
So, the resultant dipole moment vector is zero $\mu =0$.

$B{F}_3$ - trigonal planar, symmterical.
So, the resultant dipole moment vector is zero $\mu =0$.