When the two atomic p orbitals combine in same phase they form bonding πp molecular orbital of low energy.
Pi bonds are chemical bonds that are covalent in nature and involve lateral overlapping of two lobes of atomic orbital with two lobes of another atomic orbital that belongs to different atom.
Molecular orbital theory states that each of the atom tends to combine together and form the molecular orbitals. The electrons of the molecules fill up new energy states of molecular orbitals.
As a result of this arrangement, electrons are found in various atomic orbitals and they are generally associated with different nuclei. The atomic orbitals merge with each other to form molecular orbitals.
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