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what is coaxial overlapping ,lateral overlapping , pie bond and sigma bond
S. no Sigma bond (?)
1. Sigma bond is formed by co-axial or linear
overlapping of atomic orbitals as shown
below:
? bond

Pi bond (?)
Pi bond is formed by lateral or parallel or
sidewise overlapping of atomic orbitals as
shown below:
? bond
2. Sigma bond is formed by overlapping of
two hybrid orbitals or one hybrid and one
pure orbital, or two pure orbitals.

Pi bond (?)
It is always formed between two pure (i.e.,
unhybridized) orbitals.
Sigma bond
3. There is one electron-cloud density.
Pi bond (?)
There are two electron-cloud densities, one
above the other.
4. Sigma bond is stronger because of
maximum overlapping of atomic orbitals
e.g., dissociation energy for C — C bond
is 82 kcal/mole.
Pi bond is comparatively weaker because of
less overalapping of atomic orbitals, e.g.,
dissociation energy for C ? C bond is 142
kcal/mole and for C ? C. it is 198 kcal/mole.
Sigma bond
5. It exists independently.
Pi bond (?)
 It always exist along with sigma bond. i.e cannot exist independently..

Sigma bond
There can be only one sigma bond
between two atoms.
Pi bond (?)
There can be more than one pi bond between
two atoms.
Sigma bond
7. It allows free rotation of the two carbon
atoms.
Pi bond (?)
It restricts free rotation of the carbon atoms.

 
    

 
    

 


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