Which among the following species has unequal bond lengths?

Which among the following species has unequal bond lengths?
  1. SiF4
  2. SF4
  3. XeF4
  4. BF4

Solution

Species Hybridisation Bond length
BF4 sp3 (Tetrahedral) All bond lengths equal
XeF4 sp3d2 (sq. planar) All bond lengths equal
SF4 sp3d (see - saw) axial bond length > equitorial bond length
SiF4 sp3 (Tetrahedral) all bond lengths equal

Asked in: JEE Main 2021 (25 Feb Shift 2)

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