Question

Which of the following would have a permanent dipole moment

• A. BF₃
• B. SiF₄
• C. SF₄
• D. XeF₄

Answer 1

The correct option is C

SF₄

Due to distorted tetrahedral geometry $S{F}_4$ has permanent dipole moment

$\stackrel{\underset{|}{F}}{\underset{\stackrel{|}{F}}{{:-S}_{{╲}_F}^{{╱}^F}}}$