Question

The $AsF_5$ molecule is trigonal bipyramidal. The hybrid orbitals used by the As atoms for bonding are

• A. $d_{x^2-y^2}, d_{z^2},s,P_x,P_y$
• B. $d_{xy},S,P_x,P_y,P_z$
• C. $s,P_x,P_y,P_z,d_{z^2}$
• D. $d_{x^2-y^2},s,P_x,P_y$

Answer 1

Answer: (C)

$s,P_x,P_y,P_z,d_{z^2}$

Answer 2

$As= 1s^2 ,2s^2 ,2p^6 , \underbrace{ 3s^1 3p_x^1 3p_y^1 3p_z^1 3d^1 }_{ sp^3d \, \, hybridisation }$
Due to this type of hybridisation geometry of the $AsF_6$ molecule is trigonal bipyramidal and the hybrid orbitals used by As-atom ares, $p_x, p_y, p_z$ and $d_{xy }.$