Question

Which among the following species has unequal bond lengths?
(JEE (MAIN)-2021)

Answer 1

$S{F}_4$ has trigonal bipyramidal geometry and see-saw shape as shown in below structure:Here, axial bonds are longer than equatorial bonds. Thus, $S{F}_4$ has unequal bond length.
$B{F}_4^{-},Si{F}_4$ have tetrahedral geometry where all bonds are equal in respective compounds.
$Xe{F}_4$ has square planar shape where all four $Xe-F$ bonds are equal.
Hence, option (c) is the correct answer.