question_answer

In \[Br{{F}_{3}}\] molecule,the lone pairs occupy equatorial positions to minimize                            [CBSE PMT 2004]

A)                 Lone pair- lone pair repuilsion and lone pair-bond pair repulsion

B)                 Lone pair- lone pair repulsion only  

C)                 Lone pair- bond pair repulsion only

D)                 Bond pair- bond pair repulsion only

Correct Answer: B

Solution :

  Bent T-shaped geometry in which both lone pairs occupy the equatorial position of the trigonal bipyramidal here \[({{l}_{p}}-{{l}_{p}})\]repulsion = 0\[({{l}_{p}}-{{b}_{p}})\] repulsion = 4 and \[({{b}_{p}}-{{b}_{p}})\] repulsion =2