SIR, con you please tell me why the both bonds are pi bonds in carbon .molecule

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