1.

Define : i. Sigma overlap ii. pi overlap

Answer»

i. Sigma overlap (σ bond) : 

When two half-filled orbitals of two atoms overlap along the internuclear axis, it is called as sigma overlap or sigma bond.

ii. pi overlap (π bond) : 

When two half-filled orbitals of two atoms overlap side-ways (laterally), it is called as π overlap or π bond.



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