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Q. Which among the following species has unequal bond lengths?

JEE MainJEE Main 2021Chemical Bonding and Molecular Structure

A

$BF _{4}^{-}$

27%

B

$XeF _{4}$

21%

C

$SF _{4}$

48%

D

$SiF _{4}$

4%

Solution:

Species Hybridisation Bond length

$BF_4^{⊝ }$ $sp^3$ (Tetrahedral) All bond lengths equal

$XeF_4$ $sp^3d^2$ (sq. planar) All bond lengths equal

$SF_4$ $sp^3d$ (see - saw) axial bond length > equitorial bond length

$SiF_4$ $sp^3$ (Tetrahedral) all bond lengths equal