NEET 2004 Chemistry question

In molecule, the lone pairs occupy equatorial positions to minimize :-

(1)Bond pair bond pair repulsion only
(2)Lone pair lone pair repulsion and lone pair bond pair repulsionCorrect
(3)Lone pair lone pair repulsion only
(4)Lone pair bond pair repulsion only

Answer: (2)

Solution

has 5 electron pairs on Br (3 bond pairs and 2 lone pairs, ), a trigonal bipyramidal arrangement. Lone pairs prefer the equatorial positions, where each lone pair has only two neighbours at (instead of three in an axial position) and the two lone pairs are

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Question ID VK-089434