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Question

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


A

dx2-y2,dz2,s,px,py

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B

dxy,s,px,py,pz

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C

dx2-y2,s,px,py

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D

s, px, py, pz, dz2

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Solution

The correct option is D

s, px, py, pz, dz2


Explanation for correct option

Option d) s,px,py,pz,dz2

  • AsF5 has sp3dhybridisation.
  • ln sp3dhybridisation, the dz2orbital is used along with one ‘s’ and three ‘p’ orbitals to form three equatorial bonds
  • And two equally strong axial bonds for a trigonal bipyramid.

Explanation for incorrect option

Option a) dx2-y2,dz2,s,px,py

  • As the complex show sp3d hybridisation
  • Hence this arrangement is not proper .This option is incorrect

Option b) dxy,s,px,py,pz

  • As the complex involve dz2- orbital in hybridisation
  • Thus option is incorrect

Option c) dx2-y2,s,px,py

  • Since in hybridisation AsF5 do not invlove dx2-y2
  • Hence option is incorrect

The hybrid orbitals used by the As atoms for bonding are s,dz2,px,py,pz


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