How is IBr- linear???It has 2 bond pairs and 3 lone pairs and hence sp3d hybridisation but how linear structure??? explain...

IBr₂^-

two bond pairs & 3 lone pairs ...

according to bent rule , for SP³d hybridisation

all lone paires should be in equitorial position so as to minimize LP-LP repulsion...

if all three lone paires in IBr₂^- are placed at equitorial position then both Br will be

along axial position so it will be linear structure ...(all atoms lie in a same line)

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