Question

what is need of hybridisation?

Answer 1

Hey!!
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Hybridization may be defined as the phenomenon of mixing of atomic orbitals of nearly equivalent energy, involving redistribution of energy, to form new orbitals of equal energy known as hybrid orbitals. The number of hybrid orbitals is equal to the number of the orbitals hybridized. The properties of the hybrid orbitals are in between the properties of the orbitals which are hybridized.  
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Answer 2

In chemistry, orbital hybridisation (or hybridization) is the concept of mixing atomic orbitals into new hybrid orbitals (with different energies, shapes, etc., than the component atomic orbitals) suitable for the pairing of electrons to form chemical bonds in valence bond theory.