Question

What is the shape of the $IB{r}_2^{-}$ ion?

• A. Linear
• B. Bent shape with bond angle of about ${90}^o$
• C. Bent shape with bond angle of about ${109}^o$
• D. Bent shape with bond angle of about ${120}^o$

Answer 1

The correct option is A Linear

$I{Br}_2^{-}$ molecule has two bond pairs and three lone pairs. According to bent rule, for $s{p}_{3}d$ hybridisation all lone pairs should be in equitorial position so as to minimize lone pair- lone pair repulsion, if all 3 lone pairs in $I{Br}_2^{-}$ are placed at equitorial position then both Br will be along axial position, so it will be linear structure..(all atoms lie in same line)
conclusion: hence the option (A) is correct.