Q. Which of the following would have a permanent dipole moment ?
A) BF₃
B) SiF₄
C) SF₄
D) XeF₄
Explanation
[Solution from source] SF₄ has 4 bond pairs and 1 lone pair (see-saw), so its bond dipoles do not cancel. BF₃ (trigonal planar), SiF₄ (tetrahedral) and XeF₄ (square planar) are symmetric with zero net dipole. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.