please explain me the characterstic features of (pi)bond and (sigma)bond.... reply soon....

Asked by  | 5th Oct, 2012, 05:53: PM

Expert Answer:

When a carbon atom forms a compound, it always forms covalent bonds. There are two types of covalent bonds : sigma and pi bond. When the covalent bonds are linear or aligned along the plane containing the atoms, the bond is known as sigma () bond. Sigma bonds are strong and the electron sharing is maximum. Methane CH4 is a good example for sigma bond and it has four of them. 

 

When the electron orbitals overlap laterally, the bond is called the pi () bond. In pi bonds the resulting overlap is not maximum and these bonds are relatively weak. A molecule of ethylene or ethene (C2H4) has 4 bonds and 2   bonds.  In pi bonds the resulting overlap is not maximum and these bonds are relatively weak. A molecule of ethylene or ethene (C2H4) has 4  bonds and 2  bonds.  


            Pi () bond

Electrons in pi bonds are sometimes referred to as pi electrons. Molecular fragments joined by a pi bond cannot rotate about that bond without breaking the pi bond, because rotation involves destroying the parallel orientation of the constituent p orbitals.

Answered by  | 9th Oct, 2012, 02:15: PM

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