Ans Important conditions for hybridisation
(i) The orbitals present in the valence shell of the atom will take part in hybridisation.
(ii) The orbitals undergoing hybridisation should have almost equal energy
(iii) Promotion of electron is not essential condition prior to hybridisation.
(iv) It is not necessary that only half filled orbitals participate in hybridisation. In some cases, even filled orbitals of valence shell take part in hybridisation.
sp3 d3 and pentagonal bipyramidal.