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Which one of the following does NOT show sp3d2 hybridisation of its central atom?

1. [CrF6]3-
2. BrF5
3. PF5
4. SF6

Correct answer: PF5

Solution

PF5 has 5 bond pairs (trigonal bipyramidal, sp3d), while [CrF6]3-, BrF5 (5 BP + 1 LP), and SF6 each have 6 electron domains and use sp3d2.

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