Dear student,
Pi bonds result from overlap of atomic orbitals that are in contact  through two areas of overlap. Pi-bonds are more diffuse bonds than the  sigma bonds. 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.
 














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Sagar Singh
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friend,
pi bonds will not exist without the presence of sigma bonds.
and hence, there is no carbon molecule with both pi bonds.