question_answer

In\[Br{{F}_{3}}\]molecule, the lone pairs occupy equatorial positions to minimize

A)  lone pair-bond pair repulsion only

B)  bond pair-bond pair repulsion only

C)  lone pair-lone pair repulsion and lone pair-bond pair repulsion

D)  lone pair-lone pair repulsion only

Correct Answer: D

Solution :

 In\[Br{{F}_{3}}\]molecule, Br is\[s{{p}^{3}}d\]hybrid, but geometry is T-shaped due to distortion of geometry from   trigonal-bipyramidal   to T-shaped by the involvement of lone pair-lone pair     repulsion.     Here \[Ip-Ip\]repulsion\[=0\] \[Ip-bp\]repulsion\[=4\] \[bp-bp\]repulsion\[=2\]