Saturday, May 14, 2011

Distinction between Sigma and PI Bond

S. No.
SIGMA (s) BOND
PI (p) BOND
1.
The bond is formed by the axial overlap of the atomic orbitals.
The bond is formed by the sidewise overlap of the atomic orbitals.
2.
The overlap is quite larger and the bond is quite strong.
The overlap is less and the bond is comparatively weak.
3.
s-orbitals can take part in the sigma bond formation. 
s-orbitals don't take part in the bond formation.
4.Only one lobe of the p-orbital is involved in the overlap.
Both lobes of the p-orbitals are involved in the overlap. 
5.
The electron cloud of the molecular orbital is symmetrical around the internuclear axis. 
The electron cloud is unsymmetrical.
6.
The bond can be formed even in the absence of p bond.
The bond can't be formed in the absence of s bond.
7.
Free rotation of the atoms around s bond is possible.
Free rotation of the atoms around pi bond is not possible. 

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