A central atom in a molecule has two lone pairs of electrons and forms three single bonds.
2 L.P + 3 B.P = 5 (Hybridised Orbitals)
From VSEPR theory the hybridization will be sp3d fro 5 Hybridised Orbitals.
The shape of this molecule is T-shaped.
Therefore, the Correct option is (4).
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