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Pi (π) BOND:                A double covalent bond consists of one sigma (a) bond and one pi (π) bond. If two atom orbital receipt s-orbital, have their axis parallel to each other and such parallel atomic orbital overlap, the resulting bonding molecular orbital is called pi (π) bond or the bond which is formed due to side to side overlapping of two atomic orbital is called pi (π) bond. Electron density in pi (π) bond is high above and below the bonded nuclear.   SHAPES PF MOLECULES AND DIFFERENT MODERN THEORIES OF COVALENT BONDING:               Bonding is key to molecular structure and the structure is ultimately related to physical and chemical properties. The description of a covalent bond as a shared pair of electrons between two nuclear does not provide much help in determining the shape and geometry of a molecule. Similarly may other properties like bond energy bond pola...