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The AsF₅ molecule is trigonal bipyramidal. The hybrid orbitals used by the As atom for bonding are

1. d²sp³, d²s², s, pₓ, pᵧ
2. d²sp³, pₓ, pᵧ, pᶻ
3. s, pₓ, pᵧ, pᶻ, d²
4. d²sp³, s, pₓ, pᵧ, pᶻ

Correct answer: d²sp³, s, pₓ, pᵧ, pᶻ

Solution

The AsF₅ molecule has a trigonal bipyramidal geometry, which corresponds to sp³d hybridization. The orbitals involved are one s, three p, and one d orbital, forming d²sp³ hybrid orbitals.

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