why the hybrid orbitals always form sigma bond why cant they form pi bond

Hybrid orbitals always form sigma bond because their energy level and geometry favours the maximum overlap of combining orbitals which is possible only in head-on overlap with other orbitals. This results in sigma bond only.

While pi bonds are always formed by sidewise overlap which requires the orbitals to be in parallel position(at 90º to the two end of sigma bond). That is not possible in any hybridised orbitals.
In sp3 hybridised orbitals are at 109º
In sp2 hybridised orbitals are at 120º
In sp hybridised orbitals are at 180º


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