The orbitals of same energy level providing the most efficient overlapping are : (1) sp3-sp3 (2) sp-sp (3) sp2-sp2 (4) All of these

The correct option is b.
Greater is the s character in hybridised orbital smaller is the hybridised orbital and more efficient will be the overlapping.
In sp hybridization , s - character is highest as comparing to others hence most efficient overlapping.

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