Which among the following species has unequal bond lengths?

Question:
Which among the following species has unequal bond lengths?

$\mathrm{XeF}_{4}$
$\mathrm{SiF}_{4}$
$B F_{4}^{-}$
$\mathrm{SF}_{4}$

Correct Option: , 4

Solution:

$\mathrm{Sp}^{3} \mathrm{~d}$ Hybridisation Sea-saw shape $\backslash \&$ axial bond length is more than equitorial bond length

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