please explain p(pi) d (pi) bonding in SO2 
if we see sulphur shows sp2 hybridization and it doesnot have any d electrons so how and why does d orbital take part in bonding pls explain 

 If  one of the atom involved in a molecule is having vacant orbital and another is having atleast one lone pair of electrons, this electron pair is donated to that vacant orbital and this type of bonding is called p pi - p pi or p pi - d pi  depending on the orbital to which the electron pair is donated and from which the electron pair is donated. 
In SO2, ​S atom undergoes sp2 hybridisation. The vacant 3d-orbitals of S overlap with the filled 2p orbitals of O. Here, the multiple bonding is due to p pi  - d pi bonding. 

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