question_answer

In which of the following molecules/ions, all the bonds are not equal?     AIEEE  Solved  Paper-2006

A) \[S{{F}_{4}}\]  

B)                        \[Si{{F}_{4}}\]  

C)        \[Xe{{F}_{4}}\]                 

D)        \[B{{F}_{4}}\]

Correct Answer: A

Solution :

\[S{{F}_{4}}\]has trigonal bipyramidal geometry, lone pair of electrons repels the axial bond pair and decreases the bond angle to\[173{}^\circ \]. \[Si{{F}_{4}}\]Regular tetrahedral \[Xe{{F}_{4}}\] Square planar \[BF_{4}^{-}\]Tetrahedral