Question

Which of the following has a zero dipole moment?

• A. $ClF$
• B. $PC{l}_3$
• C. $Si{F}_4$
• D. $CFC{l}_3$

Answer 1

Answer: (C)

$Si{F}_4$

In $Si{F}_4$ molecule, with tetrahedral geometry, all the four $Si-F$ bond dipoles cancel each other. Hence, there is zero net dipole moment.
On the other hand, in all other molecules, the individual bond dipoles do not cancel each other. Hence, they have non zero resultant dipole moment.