MCQ
Which among the following species has unequal bond lengths?
  • A
    $BF _{4}^{-}$
  • B
    $XeF _{4}$
  • $SF _{4}$
  • D
    $SiF _{4}$

Answer

Correct option: C.
$SF _{4}$
c

Species 

Hybridisation  Bond length
$BF _{4}^{\Theta}$ $sp ^{3}$ (Tetrahedral) All bond lengths equal
$XeF _{4}$ $sp ^{3} d ^{2}$ (sq. planar) All bond lengths equal
$SF _{4}$ $sp ^{3} d ( see - saw )$ axial bond length $ > $ equitorial bond length
$SiF _{4}$ $sp ^{3}$ (Tetrahedral) all bond lengths equal

 

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